An interesting article at The American Conservative, Why Ex-Churchgoers Flocked To Trump. I am not well able to verify this from my own experience, as most conservatives/Republicans/Trump supporters I know are church-connected. I do know some at work, and I think there is some tendency for the Trump supporters to be people who used to go to church, but my sample size is too small to tell us much. At least, it does not contradict this data. The idea that people got discouraged about church and decided that didn't work for rescuing their lives or the country, and thus gravitated to Trump is intriguing.
I will add in the bit that since colonial times Appalachia has carried on the Scots, and then Scots-Irish tradition of outdoor religious festivals lasting a few days or even a week. Camp meetings and revivals were not a new thing, they were an American adaptation of an older thing. This did create some de-emphasis on church and more on intermittent intensity. Scotland wasn't the only place, of course. Saints days and festivals are known in many places.