Yeah I mean there is no evidence that vampires or fairies or werewolves exist but I suppose they could.

When someone makes a claim of UNIVERSAL morality and OBJECTIVE truth, they cannot turn around and say that they are unable to ever prove that it exists, is universal, or is objective. That isn’t how that works. We are pre-wired to believe in higher powers is not the same as universal morality. It’s just a side effect of survival of our species. And high minded (sounding) rhetoric does not change this at all.