Protestantism.

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    • Abstract:
      Protestantism is the umbrella term for dozens of different Christian denominations that can trace their roots to the Protestant Reformation, the movement to break away from the Roman Catholic Church in the early sixteenth century. The term Protestant was first used in 1529, in a dispute between Charles V, the Catholic Holy Roman emperor, and German princes who had adopted the Lutheran faith. They were called "Protestants" because they protested an imperial decree that would prevent Lutheran teaching in the empire. Eventually, the term was applied to all the churches that emerged in the Reformation or later broke from them. According to the Pew Research Center, these Protestant churches include an estimated 800 million members worldwide, making Protestantism second only to Catholicism in size. The United States, with an estimated 160 million Protestants, has the most of any single nation.