Quite a bit of room between moral and walking on water
True. But that's not really the issue is it?
If we really want to get down to it, it's that Trump supporters are retreads of the 2000 Bush v. McCain primary. People thought then Bush was too 'Christian' for them, the country and they wanted the 'realist and secularist' McCain.
Faith expressed in a campaign always made fiscal conservatives a little nervous and uncomfortable.