I'll just add the fact that rural parts of the US tend to be more religious than the urban parts. And much of the religious nature of rural areas is dominated by evangelical Protestants, which creates a divide in values and beliefs that European countries don't have.
The reason why america is more religious has to do with europe sending their religious cults, groups, fanatics to America. Presbyterianism declined in America amongst areas where the scots irish once brought it to the south because they werent even religious and pro-slavery enough hence the movement of scots irish descendants becoming southern baptists(who themselves split over supporting slavery over other baptists).
