Informing people there is no god.

[tor]

Since he is omniscient and omnipotent he could find a best possible way to convince every person on the planet without a shadow of a doubt that he exists. And if he is omnipotent he could do it.

But if you ask me what would be a good start then I guess an interview of him outside of new york while surrounded by hundreds of reporters and scientists broadcasting the whole thing all over the world on TV. After that he can try to prove us that he is god with the best explanations and proofs he can come up with. Let scientists run tests to see he is not a prankster.
And send a message to everybody on the planet in their language.
Also he can solve bunch of unsolved math problems. Do something superb here and there like move planets and stars around and stuff. That will be cool.
There are plenty ways of demonstrating extraordinary nature.
Also he can cure all diseases on the planet. Make sure everybody gets enough food. That way he can earn my respect.

You're not trying to prove it you're demanding illogical evidence.

I am not trying to prove anything I am saying that a god which does not manifest in reality is indistinguishable from the one that does not exist and should not be believed in.