section_path: Abstract
section_name: Abstract
paragraph_text: Protestantism is a branch of Christianity that emphasizes justification of sinners through faith alone, the teaching that salvation comes by unmerited divine grace, the priesthood of all believers, and the Bible as the sole infallible source of authority for Christian faith and practice. The five solae summarize the basic theological beliefs of mainstream Protestantism.
  
  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. The term, however, derives from the letter of protestation from German Lutheran princes in 1529 against an edict of the Diet of Speyer condemning the teachings of Martin Luther as heretical. In the 16th century, 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 by Protestant Reformers such as John Calvin, Huldrych Zwingli and John Knox. The political separation of the Church of England from the Roman 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 diverse, being divided into various denominations on the basis of theology and ecclesiology, not forming a single structure as with the Catholic Church, Eastern Orthodoxy or Oriental Orthodoxy. 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 one and only original church—the " one true church "—founded by Jesus Christ (though certain Protestant denominations, including historic Lutheranism, hold to this position). Some denominations do have a worldwide scope and distribution of church membership, while others are confined to a single country. A majority of Protestants are members of a handful of Protestant denominational families; Adventists, Anabaptists, Anglicans/Episcopalians, Baptists, Calvinist/Reformed, Lutherans, Methodists, Moravians, Plymouth Brethren, Presbyterians, and Quakers. Nondenominational, charismatic and independent churches are also on the rise, having recently expanded rapidly throughout much of the world, and constitute a significant part of Protestantism. 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.
  
  Today, it is the second-largest form of Christianity, with a total of 0.8 — 1.05 billion adherents worldwide or about 36.7% to 40% of all Christians.