I’m not kidding when I say it would probably result in more Republicans going to church on a weekly basis. Not because of any renewed faith but because Trump told them to.
I think he’s maxed out with evangelicals, though. The ones that don’t support him are either die hard liberals (such people probably make up 30% of evangelicals) or the minority of conservatives such as myself who are not going back to Trump.
So he’s not getting the BRTD vote, he’s not getting the votes of people like me, and some evangelicals like ExtremeRepublican who voted for him twice probably aren’t going to be swayed one way or the other by this, so I don’t see where Trump gains from such a move.
This is also why this would be a dumb strategy that he'd have nothing to gain from.
Some of the secular Trumpists might experience a Great Awakening but others may just decide they want nothing to do with it and drop out of politics or even go to the Democrats. There are a lot of working class white people in the Midwest who were really turned off by Republicans' Southern-accented moralism and didn't feel at home in the party until Trump came along for that reason.