Even theists woudn’t believe it. If I told some believer “I am god” they’d take it as a joke, but what if i actually was? What if I’m a reincarnate or some shit they talk about in religious books or whatever?

As a God, you could just make them believe you.

If my kid came out to me as the second Jesus or reincarnated Buddha, I’d ask them to prove it by doing a small miracle. Like cleaning their room or anything else that is completely impossible.