AshLSU,

I agree that it is egocentric to think that we can fully understand an omnipotent, omniscient God as described in the Bible. But when it comes to Christianity in particular--we believe that we can understand thing about God for the following reasons.

1. We believe Jesus existed. Almost all reputable scholars agree that Jesus was an actual person that actually lived and breathed and walked on this earth

2. We know that Jesus affirmed the veracity and authenticity of Old Testament scriptures. We also know jesus claimed to be God and taught various things about God.

3. So, if we know Jesus was an actual person we have to decide for ourselves in light of all the evidence that we have if he is who he said he is and if what he (and scripture) has told us about God are true and factual. As C.S. Lewis put it:

"I am trying here to prevent anyone saying the really foolish thing that people often say about Him: I'm ready to accept Jesus as a great moral teacher, but I don't accept his claim to be God. That is the one thing we must not say. A man who was merely a man and said the sort of things Jesus said would not be a great moral teacher. He would either be a lunatic — on the level with the man who says he is a poached egg — or else he would be the Devil of Hell. You must make your choice. Either this man was, and is, the Son of God, or else a madman or something worse. You can shut him up for a fool, you can spit at him and kill him as a demon or you can fall at his feet and call him Lord and God, but let us not come with any patronizing nonsense about his being a great human teacher. He has not left that open to us. He did not intend to. ... Now it seems to me obvious that He was neither a lunatic nor a fiend: and consequently, however strange or terrifying or unlikely it may seem, I have to accept the view that He was and is God."

I spoke to your question about what created God in my previous post.