[Serious] Could an omnipotent and omniscient god prove that he was God?

[Belacqua]

No, the argument is that if an omnipotent god wanted us to know it existed and have a relationship with it then we'd know and have a relationship with it.

Right. You're saying IF an omnipotent god wanted a certain thing, he would certainly do certain things. 

My response is that we don't know what an omnipotent omniscient God would do. We don't know what it would want for us, if anything. 

Also, if God is the ground of being and the form of the good and the actualization of all potentials, as Christians claim, then we DO have a relationship with it -- an extremely involved one. It's just not the kind of anthropomorphic relationship which people here seem to want. 

There are no other kinds of rationality, you either think in accordance with facts and logic or you don't.

I don't know of any other kinds of rationality. But I am a human being, and I think like a human being. It's a big universe -- who knows what things exist which humans can't begin to grasp.

Also there's the question of what the facts are. History shows that people's ideas of the facts tend to change. Naturally, we think we are the only time and place and social group in history to have the facts right. But more skeptical people keep in mind that we may be wildly wrong -- and are certainly severely limited.

  You are right, I don't think an omniscient being would have any need for reason guided by logic because it would not need a method of thinking to weed out errors, it would be incapable of errors.  If you want to know what led me away from Christianity, it was the fact that this god supposedly created us with this wonderful, capable brain and then expected us to believe in it based on faith which is nothing more than wishful thinking.  That was the contradiction that led me to start questioning my preacher who had no answer for me but to pat me on the head and tell me to go have some cookies and not think so much.

It does sound as if your personal experience of Christianity was not a persuasive one. As with all human institutions, a great deal of what we encounter is disappointing.