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Protestantism

Major branch of Christianity

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Through Christianity, Reformation and Holy Roman Empire

Protestants follow the theological tenets of the Protestant Reformation, a movement that began in the 16th century with the goal of reforming the Catholic Church from perceived errors, abuses, and discrepancies. The Reformation began in the Holy Roman Empire in 1517, when Martin Luther published his Ninety-five Theses as a reaction against abuses in the sale of indulgences by the Catholic Church, which purported to offer the remission of the temporal punishment of sins to their purchasers. Luther's statements questioned the Catholic Church's role as negotiator between people and God, especially when it came to the indulgence arrangement, which in part granted people the power to purchase a certificate of pardon for the penalization of their sins. Luther argued against the practice of buying or earning forgiveness, claiming instead that salvation is a gift God gives to those who have faith.

Lutheranism spread from Germany into Denmark–Norway, Sweden, Finland, Livonia, and Iceland. Calvinist churches spread in Germany, Hungary, the Netherlands, Scotland, Switzerland, France, Poland and Lithuania, led by Protestant Reformers such as John Calvin, Huldrych Zwingli and John Knox. The political separation of the Church of England from the Catholic Church under King Henry VIII began Anglicanism, bringing England and Wales into this broad Reformation movement, under the leadership of reformer Thomas Cranmer, whose work forged Anglican doctrine and identity.

Protestantism is divided into various denominations on the basis of theology and ecclesiology. Protestants adhere to the concept of an invisible church, in contrast to the Catholic, the Eastern Orthodox Church, the Oriental Orthodox Churches, the Assyrian Church of the East, and the Ancient Church of the East, which all understand themselves as the only original church—the "one true church"—founded by Jesus Christ (though certain Protestant denominations, including historic Lutheranism, hold to this position). A majority of Protestants are members of a handful of Protestant denominational families; Anglicans/Episcopalians, Baptists, Calvinist/Reformed, Lutherans, Methodists and Moravians. Furthermore, Adventists, Pentecostals, Quakers, Plymouth Brethren, independent churches also known as Nondenominational Christianity, and Charismatic Christianity can also be considered part of Protestantism broadly speaking. Independent/Non-Denominational churches are on the rise, having recently expanded rapidly throughout much of the world. These various movements, collectively labeled "popular Protestantism" by scholars such as Peter L. Berger, have been called one of the contemporary world's most dynamic religious movements.

Historically speaking however, Protestantism includes only the denominations that emerged directly during the Protestant Reformation, thus excluding any denomination that emerged after this period. In 2004, Hans Hillerbrand estimated a total Protestant population of 833,457,000, while the World Christian Database estimated 637,856,000 Protestants and 426,370,000 Independents (mostly non-denominational Pentecostals who do not self-identify as Protestants) in early 2026.

Terminology

Six princes of the Holy Roman Empire and rulers of fourteen Imperial Free Cities, who issued a protest (or dissent) against the edict of the Diet of Speyer (1529), were the first individuals to be called Protestants. The term protestant, though initially purely political in nature, later acquired a broader sense, referring to a member of any Western church which subscribed to the main Protestant principles. A Protestant is an adherent of any of those Christian bodies that separated from the Church of Rome during the Reformation, or of any group descended from them.

During the Reformation, the term protestant was hardly used outside of German politics. People who were involved in the religious movement used the word evangelical (German: evangelisch). Gradually, protestant became a general term, meaning any adherent of the Reformation in the German-speaking area. It was ultimately somewhat taken up by Lutherans, even though Martin Luther himself insisted on Christian or evangelical as the only acceptable names for individuals who professed faith in Christ. French and Swiss Protestants instead preferred the word reformed, which became a popular, neutral, and alternative name for Calvinists.

The word evangelical, which refers to the gospel, was widely used for those involved in the religious movement in the German-speaking area beginning in 1517. Evangelical is still preferred among some of the historical Protestant denominations in the Lutheran, Calvinist, and United (Lutheran and Reformed) Protestant traditions in Europe, and those with strong ties to them. Above all the term is used by Protestant bodies in the German-speaking area, such as the Protestant Church in Germany. Thus, the German word evangelisch means Protestant, while the German evangelikal, refers to churches shaped by Evangelicalism. The English word evangelical usually refers to evangelical Protestant churches, and therefore to a certain part of Protestantism rather than to Protestantism as a whole. The English word traces its roots back to the Puritans in England, where Evangelicalism originated, and then was brought to the United States.

Martin Luther always disliked the term Lutheran, preferring the term evangelical, which was derived from euangelion, a Greek word meaning "good news" (i.e. "gospel"). The followers of John Calvin, Huldrych Zwingli, and other theologians linked to the Reformed tradition, also began to use that term. To distinguish the two evangelical groups, others began to refer to the two groups as Evangelical Lutheran and Evangelical Reformed. Lutherans themselves began to use the term Lutheran in the middle of the 16th century, in order to distinguish themselves from other groups such as the Philippists and Calvinists.

The German word reformatorisch, which roughly translates to English as "reformational" or "reforming", is used as an alternative for evangelisch in German, and is different from English reformed (German: reformiert), which refers to churches shaped by ideas of John Calvin, Huldrych Zwingli, and other Reformed theologians. Derived from the word "Reformation", the term emerged around the same time as Evangelical (1517) and Protestant (1529).

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