Why so many Baptists in the USA? I could go ask on beliefnet.com, but they would probably think I'm trolling. So I'll ask here. notes: Baptists are the second largest denominational group in the USA. The largest is the Catholics, and I think I understand their story. Baptists in the USA number over 32,000,000. And if you disregard babies and young children as members, which is the way Baptist churches count, then the difference with Catholics gets much smaller. And no other denominational groups are even close in size. The founders of the US government were mostly a mix of Congregationalists, Unitarians and Anglicans. Other denominations, such as Presbyterians and Lutherans, emigrated from Europe later in large numbers. Methodists almost completely dominated missionary activity in the USA during the nineteenth century. Nevertheless, Baptists rule numerically, especially in the deep South states. One partial answer: The African-American history with Christianity in the USA. But that can only be a partial answer. What is there about Baptist teachings, worship, society, etc. that gave them such a boost?