Assuming there is a god, would he make up his own god to escape from reality like humans did? What sort of god would a powerful god want to believe in? Even superheroes would rather believe there are super-superheroes who are stronger than them out there to help them, like batman wanting to believe in superman.
I think an omnipotent god would create a very sophisticated theology about a universe before this one to explain his own existence. And omniscience wouldn't matter, because he would know there was no way of knowing that he knew everything, including how he came into being. He would probably create a Descartes Demon to explain how there would be things that he couldn't know, outside of the time and universe that he had been "born" into. Everything I said rests on the assumption God has emotions similar to a human, but if he's not then all bets are off the table: his god could either be a reasonable one, or one of pure malice.