What Is a Protestant?

Short-answer box

A Protestant is a Christian who belongs to one of the many church traditions that grew out of, or were reshaped by, the Protestant Reformation of sixteenth-century Europe. Protestantism is not a single church, and it has no worldwide head comparable to the pope. It is a broad family of churches, including Lutheran, Reformed, Anglican, Baptist, Methodist, Pentecostal, and many independent churches, that differ in worship, church government, and theology.

The name comes from a formal legal protest, not from a general habit of objecting. In April 1529, at the Diet of Speyer in Germany, a group of princes and cities formally protested a decision to roll back religious reforms, and their opponents began calling them Protestants. The label stuck, and it is now used for the whole family of Western Christian traditions that do not accept the authority of the pope.

What the word means

Dictionaries give the word in two senses. In the narrow sense, a Protestant is a member of a church denomination that rejects the universal authority of the pope and affirms the Reformation principles of justification by faith alone, the priesthood of all believers, and the Bible as the only source of revealed truth. In the broad sense, the word is used for any Christian who is not Catholic or Eastern Orthodox. Both senses are in everyday use, and the broad sense is the one most surveys use when they count Protestants.

That breadth is the first thing to understand. Asking what a Protestant is does not have one short denominational answer, the way asking what a Lutheran or a Methodist is does. A Protestant might worship in a stone cathedral with a choir and a printed liturgy, in a plain meeting room with unaccompanied singing, or in a large modern auditorium with a band. The churches share a family history and some common themes, but they do not share one catechism, one liturgy, or one governing body.

The word is also used as an adjective, as in “a Protestant church” or “Protestant theology.” It is not a synonym for “Christian” in general, since Catholics and Orthodox Christians are Christians too, and it is not a synonym for “evangelical,” which names a smaller movement inside Protestantism.

Where the name comes from

The name was born in imperial politics before it became a church label. In 1526, at an earlier Diet of Speyer, the rulers of the Holy Roman Empire agreed that, until a general church council settled matters, each ruler would manage religious affairs in his own territory. That agreement gave the Lutheran reforms breathing room, and Lutheran churches, schools, and civic institutions spread across German territories and cities.

Three years later the mood had changed. At the second Diet of Speyer in 1529, the Catholic majority voted to reverse course: the religious status quo was to be preserved, no new reforms were to be introduced where they had not already taken hold, and the Mass was to be tolerated everywhere. The 1521 Edict of Worms, which had outlawed Martin Luther and banned his writings, was to be enforced again.

A minority refused to accept the reversal. Six princes and the representatives of fourteen imperial cities handed in a formal written protest, a Protestatio in Latin, arguing that the earlier unanimous agreement could not be overturned by a majority vote, and that in matters of faith they answered to God and to Scripture. Their opponents began calling them Protestants, from the Latin word for those who protest or declare. The name soon spread beyond Germany.

Two details are worth keeping straight. First, the reformers themselves did not at first call their churches Protestant. In Germany they generally called themselves evangelici, meaning people of the gospel. Second, the protest at Speyer was a legal objection to a specific imperial decision, not a founding act of a new church. The churches already existed in the territories that signed it.

How the Reformation began

The movement that produced the Protestants began as an argument inside the Western church, not as a plan to found new churches. Its conventional starting point is October 31, 1517, when Martin Luther, an Augustinian monk and professor at Wittenberg in Germany, set out his Ninety-five Theses on indulgences. According to tradition, he posted them on the door of the Castle Church in Wittenberg. What is certain from the historical record is that he sent them to Archbishop Albert of Mainz that day, intending them as propositions for academic debate.

An indulgence, in the teaching of the time, was the remission of part of the temporal penalty due for sin, granted on papal authority as part of the sacrament of penance. The doctrine itself was uncertain in the Roman Catholic Church before the Council of Trent (1545 to 1563) defined it and removed abuses. Luther’s theses attacked the financial and doctrinal abuses around the sale of indulgences, including the claims made by sellers raising money partly to help finance the rebuilding of St. Peter’s Basilica in Rome. Luther argued, among other things, that the pope had no jurisdiction over purgatory, and that true repentance was inward and spiritual rather than something that could be bought.

Translated from Latin into German, printed, and distributed widely, the theses widened a dispute about indulgences into a debate about salvation, Scripture, and papal authority. Luther had not set out to divide the church, but when the papacy declared his position heretical, he answered by denying the infallibility of popes and of councils as well, and by declaring Scripture the only basis of authority.

The break then became institutional. On June 15, 1520, Pope Leo X issued the bull Exsurge Domine, condemning Luther’s teachings on 41 counts. Luther publicly burned a copy of the bull at Wittenberg. At the Diet of Worms in 1521, he again refused to retract his views unless convinced by Scripture or reason, and he was declared an outlaw. In hiding at Wartburg Castle, he began translating the New Testament into German, putting Scripture into the language ordinary people spoke.

Luther’s reforms went well beyond indulgences. He reduced the number of sacraments from seven to two, baptism and the Eucharist, on the grounds that a sacrament must be a rite instituted by Christ himself as revealed in Scripture. He taught the priesthood of all believers, meaning that every Christian is spiritually a priest, even though not every Christian is vocationally a pastor. And he rejected transubstantiation, the teaching that the bread and wine of communion change in substance into the body and blood of Christ, holding instead that Christ’s body is present “with, in, and under” the elements.

From protest to settlement

Once churches had broken with Rome, rulers and theologians had to decide what legal standing the new churches would have. The first great settlement came at Augsburg. In 1530, at the Diet of Augsburg, the Lutheran princes presented the Augsburg Confession to Emperor Charles V. The confession, prepared by Luther’s colleague Philip Melanchthon, set out the Lutheran faith in moderate terms and became the authoritative statement of Lutheran belief.

Twenty-five years later, the Peace of Augsburg, signed on September 25, 1555, gave that settlement legal force in the Holy Roman Empire. Its governing principle, summed up in the Latin phrase cuius regio, eius religio (whose realm, his religion), let each territorial ruler choose either Catholicism or the Lutheran confession defined by the Augsburg Confession for his own territory. The agreement recognized two legitimate confessions in the empire.

The settlement was limited in ways that matter for understanding the word Protestant. It protected only adherents of the Augsburg Confession. Reformed churches following Calvin and the Anabaptists were not covered, and the peace was not a grant of religious toleration to individuals. A subject who disagreed with his ruler’s chosen confession faced conversion, emigration, or suppression. Historians often treat the Peace of Westphalia of 1648, which ended the Thirty Years’ War, as the later settlement that extended legal recognition to the Reformed churches as well.

The English Reformation followed a different path, driven as much by politics as by theology. Henry VIII broke with Rome after the pope refused to annul his marriage to Catherine of Aragon, and the Act of Supremacy of 1534 made the king, rather than the pope, the supreme head of the Church of England. Under his son Edward VI, Archbishop Thomas Cranmer advanced Protestant reform and introduced the Book of Common Prayer. After a Catholic restoration under Mary I, Elizabeth I’s settlement of 1559 steered a middle way, often called the via media, keeping bishops and much of the old ritual while adopting Protestant theology.

The five solas, explained honestly

Visitors to Protestant churches will often meet five Latin slogans, the five solas, offered as a summary of Reformation faith:

• Sola scriptura, by Scripture alone: the Bible is the highest authority for faith and practice.
• Sola fide, by faith alone: a person is put right with God through faith in Christ, not by human merit.
• Sola gratia, by grace alone: salvation is God’s free gift, not something earned.
• Solus Christus, through Christ alone: Christ is the only mediator and savior.
• Soli Deo gloria, to the glory of God alone: all of salvation, from beginning to end, is to God’s glory.

These slogans are genuinely useful as a summary, but one honest qualification belongs with them. The five solas were not used as a set of slogans by the reformers themselves. Neither Luther nor Calvin summarized his teaching in a tidy five-point list. The fivefold summary took shape in the nineteenth and twentieth centuries as a shorthand for Reformed theology, and it captures the heart of the Reformation’s concerns even though it came later.

The solas should also not be treated as a test every Protestant church passes in the same way. Many Protestant traditions affirm them wholeheartedly, but they interpret them differently. Anabaptist churches, for example, have historically understood justification in terms of a real, lived righteousness rather than the legal framework associated with Luther’s teaching. The solas describe a family resemblance, not a uniform confession.

The major Protestant families

The Protestant family tree has several large branches. Each began in a particular place and time, and each still shapes churches today.

Lutheran churches trace directly to Luther and to the Augsburg Confession of 1530. They keep baptism and the Eucharist as the two sacraments, they use creeds and liturgies, and they organize under bishops or synods depending on the country. Lutheranism remains strong in Germany and Scandinavia, and spread through immigration and missions worldwide.

Reformed churches trace to the Swiss reformers Huldrych Zwingli in Zurich and John Calvin in Geneva. Zwingli, who became priest at Zurich in 1518, preached against indulgences, fasting rules, and priestly celibacy. Calvin, whose Institutes of the Christian Religion appeared in 1536, built a disciplined church order in Geneva in which pastors preached and taught while lay elders, called presbyters, shared in governing and discipline. That presbyterian pattern, government by elders in graded councils, traveled through John Knox to Scotland and through Dutch and German immigrants to North America.

Anglican churches descend from the Church of England’s break with Rome. They kept bishops and a liturgical pattern anchored in the Book of Common Prayer, while adopting Protestant teaching on Scripture and salvation. The worldwide Anglican Communion, including the Episcopal Church in the United States, is often counted within Protestantism in broad surveys, although many Anglicans describe their tradition as both Catholic and Reformed, holding together elements of both heritages.

Anabaptist churches belong to what historians call the Radical Reformation. In January 1525, in Zurich, a group of Zwingli’s former associates concluded that baptism should follow a believer’s own profession of faith, not be administered to infants, and they baptized one another. The name Anabaptist, meaning “rebaptizer,” was given to them by their opponents. Anabaptists also insisted on a church separate from the state, and on a disciplined community life. Their descendants today include Mennonites, Amish, and Brethren churches. Some classifications count Anabaptists within Protestantism and others treat the Radical Reformation as a distinct movement alongside it.

Baptist churches grew out of seventeenth-century England and spread powerfully in North America. Like Anabaptists, Baptists practice believer’s baptism, normally by immersion, and they hold that Scripture alone governs faith and practice. They also emphasize the priesthood of every believer, religious liberty, and congregational government, in which each local church governs itself. Baptists are today the largest single family of Protestant denominations in the United States.

Methodist churches began as a revival movement inside the Church of England in the eighteenth century, led by John Wesley and his brother Charles, with George Whitefield as another early leader. The name Methodist came from the methodical way the early members pursued prayer, Bible study, and good works. Methodists emphasize the new birth, assurance through the witness of the Holy Spirit, and sanctification, the transforming work of grace in a Christian’s character. Scripture is treated as the primary authority, alongside Christian tradition and the historic creeds. Methodism separated from the Church of England in the years around Wesley’s death and spread through missionary work worldwide.

Pentecostal churches are the youngest large branch. Their roots lie in the Holiness movement that grew out of Methodism, and in the teaching that baptism in the Holy Spirit, often evidenced by speaking in tongues, is a distinct experience after conversion. In 1901, Charles Parham’s Bible school in Topeka, Kansas, became an early center of this teaching, and in 1906 William Seymour led the Azusa Street revival in Los Angeles, from which Pentecostalism spread worldwide.

Finally, a large and growing part of modern Protestantism sits outside the historic denominations altogether. Independent and nondenominational churches govern themselves locally and share preaching-centered worship, contemporary music, and an emphasis on personal conversion.

What most Protestants share, and where they differ

Across this diversity, a few common threads recur. Most Protestant churches give the Bible a central and authoritative place, preach from it in worship, and make it available in the language of the congregation, a legacy of the reformers’ vernacular translations. Most celebrate baptism and communion as the central rites, though they disagree about what those rites do and who should receive them. Most affirm that ordinary believers have direct access to God and a share in the life of the church, even though they organize that share very differently.

The differences are just as real. On baptism, Lutherans, Reformed, Anglicans, and Methodists baptize infants as well as adults, while Baptists, Anabaptists, Pentecostals, and most independent churches baptize only those old enough to profess faith. On communion, Lutherans teach Christ’s real presence “with, in, and under” the bread and wine, Reformed churches teach a spiritual presence received by faith, and many Baptist and independent churches treat communion as a memorial. On church government, Anglicans and some Lutherans keep bishops, Presbyterians govern through councils of elders, and Baptists and independent churches govern congregationally. On worship, some Protestant churches follow a fixed liturgy with set prayers and a church calendar, while others leave worship almost entirely free in form.

These differences have sometimes produced sharp disagreement, including, in the sixteenth and seventeenth centuries, persecution of one Protestant group by another. The Anabaptists, for example, were punished by Catholic and Protestant authorities alike, and the Peace of Augsburg itself excluded them from legal protection.

Protestant, Catholic, and Orthodox at a glance

Readers often want a quick comparison with the other two great branches of Christianity. The summary below gives the usual positions as each tradition presents them. It is a simplification, and every row has exceptions.

Authority: most Protestant churches hold Scripture as the highest authority, with tradition and reason in supporting roles. Catholic teaching holds Scripture together with sacred tradition, interpreted by the church’s teaching authority under the pope. Orthodox teaching holds Scripture within the tradition of the church, interpreted through the councils and the fathers, without a single universal head.

The pope: Protestant churches do not accept the universal jurisdiction of the bishop of Rome. Catholic churches do. Orthodox churches honor the pope as a historic patriarch but do not accept universal jurisdiction over the whole church.

Sacraments: most Protestant churches recognize two sacraments, baptism and communion, although some count additional rites as ordinances rather than sacraments, and Quakers and the Salvation Army observe neither in the usual form. Catholic and Orthodox churches count seven sacraments, called mysteries in Orthodox usage.

Clergy and worship: most Protestant churches permit married clergy and conduct worship mainly in the local language. All three branches ordain clergy, but they understand ordination and apostolic succession differently.

All three branches affirm the Trinity and Jesus Christ as savior; most affirm the ancient creeds; and all three practice baptism and communion in some form. The differences concern authority, church order, and the interpretation of particular doctrines, not the basic confession of Christian faith.

Protestantism around the world today

Protestantism began in Europe but no longer belongs mainly to Europe. The Pew Research Center’s Global Christianity report, based on 2010 data and published in December 2011, counted about 801 million Protestants worldwide on a broad definition that includes Anglicans and independent churches, making up about 37 percent of the global Christian population. The United States held the largest Protestant population, about 160 million, or about a fifth of the world total, followed by Nigeria with nearly 60 million. The ten countries with the largest Protestant populations together held about 61 percent of the world’s Protestants, and Protestants formed a majority of the population in 49 countries.

The same report showed how far the center of gravity had moved. Sub-Saharan Africa held about 37 percent of the world’s Protestants, the Americas about 33 percent, the Asia-Pacific region about 17 percent, and Europe only about 13 percent, with the Middle East and North Africa below 1 percent.

In the United States, Protestants remain the largest Christian grouping, but their share has declined. Pew’s 2023-24 Religious Landscape Study found that 40 percent of American adults identify as Protestant, while Catholics account for 19 percent. Within American Protestantism, evangelical Protestants make up 23 percent of adults, mainline Protestants 11 percent, and historically Black Protestant churches 5 percent. Baptists are the largest single denominational family at 12 percent of adults, including 4 percent who identify with the Southern Baptist Convention. The United Methodist Church, at 3 percent, is the largest mainline denomination. Nondenominational Protestants, at 7 percent, are the second-largest family and the only Protestant family that has grown as a share of the population since the first landscape survey in 2007.

Counting Protestants is not exact. Surveys count people who identify themselves as Protestant, and the boundaries of the label vary. Pew’s broad definition includes Anglicans and independent churches. Other counts separate Anglicans out, or count some independent churches separately. Any world total for Protestants is therefore an estimate built on a stated definition, and readers comparing two totals should check which definition each source used.

Common misunderstandings

Several misunderstandings recur in questions about Protestants. The first is that Protestantism is one church. It is not. There is no Protestant pope, no single Protestant catechism, and no body that can speak for all Protestants. When news reports say “Protestants believe” something, they usually mean a particular tradition, or a majority in a particular survey, not the whole family.

The second is that the name means perpetual protesting. The Speyer protest was a specific legal act in 1529. Most Protestants today would describe their faith in positive terms, in what they affirm about Scripture, grace, and Christ, rather than in terms of protest against another church.

The third is that all Protestants agree on the five solas, or that the solas were the reformers’ own slogans. As noted above, the fivefold list is a later summary, and traditions interpret its points differently.

The fourth is that every non-Catholic Western church counts as Protestant. Pew’s survey scheme, for example, places Latter-day Saints and Jehovah’s Witnesses outside Protestantism, in an “other Christians” category totaling about 3 percent of American adults. Classifications of groups on the edges of the Protestant family vary by source.

Frequently asked questions

What is a Protestant in simple terms?

A Protestant is a Christian who belongs to a church tradition that comes from the sixteenth-century Reformation, such as Lutheran, Reformed, Anglican, Baptist, Methodist, or Pentecostal churches. Protestants do not accept the authority of the pope, and their churches have no single worldwide head.

Why are they called Protestants?

The name comes from the formal protest handed in at the Diet of Speyer in April 1529, when six princes and fourteen imperial cities objected to a decision reversing religious reforms. Their opponents called them Protestants, and the name stuck.

Who started Protestantism?

No single person founded it, but the conventional starting point is Martin Luther’s Ninety-five Theses of October 31, 1517. Reformers in Switzerland, England, and elsewhere soon developed their own movements, so Protestantism grew from several centers, not one.

What do Protestants believe?

Beliefs vary by tradition, but common themes include the authority of Scripture, salvation by God’s grace received through faith in Christ, the priesthood of all believers, and worship centered on preaching and on baptism and communion. The five solas summarize these themes, although they are a later summary rather than a creed the reformers recited.

How is a Protestant different from a Catholic?

The main differences concern authority and church order. Protestant churches do not accept the pope’s universal jurisdiction, they generally recognize two sacraments rather than seven, and they give Scripture the highest authority. Catholics hold Scripture together with sacred tradition under the teaching authority of the church. Both affirm the ancient creeds and the Trinity.

Are Anglicans Protestant?

In broad surveys, yes. Pew’s broad definition of Protestant includes Anglicans. But many Anglicans describe their tradition as both Catholic and Reformed, and Anglican worship often looks more traditional than that of other Protestant churches, so the label fits Anglicans more loosely than it fits Lutherans or Baptists.

How many Protestants are there in the world?

On Pew’s broad 2010-based definition, about 801 million, or about 37 percent of the world’s Christians. The United States has the largest number, about 160 million, followed by Nigeria with nearly 60 million. Any total depends on the definition used, so totals from different sources will differ.

Sources & references

• Encyclopaedia Britannica, "Protestantism," including the Ninety-five Theses section. Opened and read October 25, 2026.
• Encyclopaedia Britannica, "Ninety-five Theses." Opened and read October 25, 2026.
• Encyclopaedia Britannica, "Today in History: October 31, 1517." Opened and read October 25, 2026.
• Merriam-Webster, "Protestant: Definition and Meaning." Opened and read October 25, 2026.
• Encyclopaedia Britannica, 1911 edition, "Protestant," via Wikisource. Opened and read October 25, 2026.
• Pew Research Center, "Global Christianity," December 2011. Opened and read October 25, 2026.
• Pew Research Center, "Religious Landscape Study: Religious Identity in the United States," 2023-24 survey, published February 2025. Opened and read October 25, 2026.
• Ligonier Ministries, "What Are the Five Solas?" Opened and read October 25, 2026.
• Seedbed, "The Five Solas: A Conjunctive Approach." Opened and read October 25, 2026.
• University of Oregon, "Resolution of the Imperial Diet of Augsburg, 1555." Opened and read October 25, 2026.
• Christianity Today, "1525: The Anabaptist Movement Begins." Opened and read October 25, 2026.
• Missouri State University, "Calvin and the Reformed Tradition." Opened and read October 25, 2026.
• University of Washington, "John Calvin (1509-1564) in Geneva" course notes. Opened and read October 25, 2026.
• Wikipedia, "Methodism" and "Methodist movement." Opened and read October 25, 2026.
• Biblia.com, "The Birth of Pentecostalism" (church history resource). Opened and read October 25, 2026.