Are you asking me who created the creator? The only answer I have for you regarding this; is that the God of Nature is likely eternal. Some atheists have a similar view on our universe itself and claim that the universe is eternal.
If God is eternal then he exists in a context which is as eternal as he is. The multiverse? Why not a multiverse which operates on its own with no need of a god?
Also, if you believe in God, you believe in magic. Your God is a cosmic sorcerer who pulls universes out of empty space as a stage magician might pull doves out of his sleeve.
