Hard to say who is using whom. Narcissists think themselves smarter than everyone else and that describes not only Trump but also these "preachers" of the "prosperity gospel" who enriched themselves, not their flock. Trump likes to bamboozle his customers and I think he sees these "religious" as a customer base who are all too willing to buy his nonsense. They made a Faustian bargain and more and more people are seeing through this. This might play to the base of the credulous but mainstream Americans know these folks just want to satiate their lust for power and couldn't care less abut any of Christ's teachings.