God is God. No body has created HIM. As soon as we claim that some one has created God, then God ceases to be a God. So He was from the starting, he is today and will remain for ever. He is a creator and no body has created HIM.
God has always and will always continue to exist for eternity. As stated in Psalm 90:2, "Before the mountains themselves were born, Or you proceeded to bring forth as with labor pains the earth and the productive land, Even from time indefinite to time indefinite you are God."
If you want to believe the bible, god was just there, not created, just has always been. However, if you want to believe history, then man created gods to answer the questions they could not. Such as where did the earth come from? Answer, God. Where did that lightening come from? God. You see how easy that is?