Might have something to do with the fact that, in Europe, they had to live alongside other people. In America they had their little bubbles where the crazy could echo and become stronger. Combine that with the amount of opportunistic grifters that came to and were bred in America. The “land of opportunity” inspired an individualistic greed that was more than happy to use religion to feed itself. The Mormons are the classic example.

Catholics in America were a minority and there was bigotry directed at them. They were more inclined to keep separate—not so much now. In my town, the catholic school kids would have Catholic slurs shouted at them by the public school kids. These days the conservative Catholics are more or less allied with the evangelical Protestants.