High Quality Content by WIKIPEDIA articles! Protestantism is one of the three major divisions within Christianity together with the Eastern Orthodox Church and the Roman Catholic Church. The term is most closely tied to those groups that separated from the Roman Catholic Church in the 16th century Protestant Reformation. The doctrines of the various Protestant denominations vary, but nearly unanimous doctrines include justification by grace through faith and not through works, the priesthood of all believers, and the Bible as the ultimate authority in matters of faith and order. The followers of Martin Luther established the evangelical churches of Germany and Scandinavia. Reformed churches in Switzerland were established by John Calvin and more radical reformers such as Huldrych Zwingli. Thomas Cranmer reformed the Church of England and later John Knox established a more radical Calvinist communion in the Church of Scotland.