There is a natural explanation for it and if science figured out the answer to your question you would simply move your goal post or ask another question that can never be answered. There are some things we will never know like what happened 13 billion years before the big bang. Or are there other universes? So you can settle on an ancient religion your ancestors invented or keep looking for the truthBut it's not a superstition believing a entity, calling itself God, created itself?I'd like to believe that the universe created itself, but I just don't have faith in such superstitions.
I think the evidence indicates that a power not confined to this universe or its laws caused everything in this universe to happen. Perhaps you believe that the universe caused itself to happen. If so, how did the universe cause itself to come into existence?