God always exited, exists now, and always will exist. God has no creator.

God is extremely great. He is way beyond this universe, but we know only things of this universe. We understand Him only a little. If there was some way that God came to be God, it did not happen in any way we could begin to understand. The question of where God came from is meaningless to us because of our lack of knowledge and understanding of things outside of our universe.

Of course, we are only finding out a little about our universe. We are so extremely weak mentally. If we knew everything about our universe, then maybe we could start to think about whatever is outside of it.