To summarize it down to you here are my thoughts. If you believe in god then what do you think created the god (dont say he has always been there because thats bullshit) On the science side. Since the big bang was caused by 2 universes colliding in the multiverse. Then what created the multiverse?
What if that which we call god created god (I don't personally see god in the traditional religious sense by the way, not as an external entity that is apart from its own creation). God/universe created himself/itself. Its quite possible that the universe has always been here. Maybe to God time doesn't exist as we have come to understand it. It could be that he has no beginning and no end, and at the same time is the beginning and the end of everything. It could very well be that embracing this paradox could bring you closer to understanding the answer to your question.
I think similar to this. The universe is something that we know is true/a fact. A creator on the other hand has yet to be proven and is something that I view as highly unlikely. Matter cannot be created nor destroyed which implies to me that the universe is eternal. So I don't see why the universe couldn't have always been here and needs no creator. "I'm to drunk, to taste this chicken" -Talladega nights