It seems most of his associates, and he himself, are Randians, which is the very opposite of religious:

https://www.washingtonpost.com/news/powerpost/paloma/daily-202/2016/12/13/daily-202-ayn-rand-acolyte-donald-trump-stacks-his-cabinet-with-fellow-objectivists/584f5cdfe9b69b36fcfeaf3b/?utm_term=.376749fde0ea