I believe the big bang created the universe as we know it today. Its a simple and understandable theory, big explosion spreads matters around, matter gathers together forms supermassive black holes, supermassive black holes create stars in surounding matter. Stars gravity helps to produce planets planet, walla earth. What I cant explain nor have I heard an explaination of is how the matter that was condensed to such a point got there in the first place. Obviously matter doesnt appear out of nowhere now, so it had to come from someplace, which is why there is room for a diety. We still know very little about our universe ad have much to learn. I would be curious as to whether or not a big bang hasnt happened many times in the past recreating the universe. Whether or not there are more universes out there, much like galaxies. Until the day we know everything about the universe I think something had to help out the big bang a little bit to get started.