If there were only some way to prove it, I would happily bet everything I own that Donald Trump does not believe in God. Not because he's carefully engaged the many philosophical proofs for atheism that are out there, of course. He's simply too much of a sociopathic narcissist to believe in anything higher than himself. He also, as recent court verdicts regarding sexual assault and massive fraud demonstrate, has no moral compass. He's only too happy to be party to attempted murder, in fact, as long as it's someone else who takes the risk of prison for it.
Alas, there's no way to force Trump to tell the truth about his lack of belief in God, but there are plenty of signs of his deep contempt for religion. Multiple witnesses have described how he laughs at Christians behind their backs, calling their faith "bullshit." When he play-acts belief in public, he struggles to hide his scorn, failing to acknowledge basic precepts of Christianity that even most non-believers understand.
