The article I read on it before the election (which I can't find right now, oh well) showed the extreme lack of depth to his theological thinking, yes. To call the man shallow is a bit of an insult to puddles.

Basically, he went to Peale's church because his father did, and then stayed there, because really, the success gospel is made for him. (But seems to identify, himself, as Presbyterian, since he was confirmed with them.)

One article I may have been thinking of: https://www.nytimes.com/2016/09/06/nyregion/donald-trump-marble-collegiate-church-norman-vincent-peale.html?_r=0