Thats a logical fallacy. Either God and the Universe needs a creator or God and the Universe do not need a creator. You are claiming that the Universe needs a creator but God doesn't, treating them differently to arrive at your desired conclusion.
You are also assuming that the Universe began at the Big Bang, when that is not true (we cant know for sure since we theoretically cant see past the Big Bang). Space-time would have existed before the Big Bang, with the Big Bang itself being the explosion of a large amount of energy from a single point in space.







