<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Protestantism is the largest grouping of Christians in the United States with its combined denominations collectively accounting for about half the country's population or 150 million people . Simultaneously, this corresponds to around 20% of the world's total Protestant population . America has the largest number of Protestants of any country in the world . Baptists account for about one third of American Protestants . The Southern Baptist Convention is the largest single Protestant denomination in the United States with one - tenth of American Protestants . </P> <P> The country's history is often traced back to the Pilgrim Fathers whose Brownist beliefs motivated their move from England to the New World . These English dissenters, who also happened to be Puritans--and therefore--Calvinists, were first to settle in what was to become the Plymouth Colony . America's Calvinist heritage is often underlined by various experts, researchers and authors, prompting some to declare that the United States was "founded on Calvinism", while also underlining its exceptional foundation as a Protestant majority nation . American Protestantism has been diverse from the very beginning with large numbers of early immigrants being Anglican, various Reformed, Lutheran, and also Anabaptist . In the next centuries, it diversified even more with the Great Awakenings throughout the country . American Protestantism has a special vitality, offering a wide array of branches and being arguably more diverse than that in any other country . </P>

How many protestants are in the united states