You don't need god to have the universe, because then you'll need another god to create this god and so on. Things are not created, according to modern physics, all is energy in one form or another. In other words, everything exists spontaneously in a thermodynamic balance locally and universally. Life emerged as the most favorable thermodynamic state for some of the energy on earth back than. We are just trapped energy.
Can we really create anything? No, we can only transform energy and in doing so, we abide by the physical laws of the universe.
Either way, we have no proof whether god exists but we do have a proof that people find the notion of god very necessary, and I think it's rather easy to see it. This, in my opinion, is simply the personification of nature, because in human the connection with it is lost and overwritten by our consciousness. It's very easy to see this in the different ways people comprehend the notion of god. For example, for people who favor authority, god is one almighty patriarch, strong and fierce men ready to punish you for disrespecting him. While for people, who favor compassion, he is the most compassionate, forgiving being. For people, who don't support the concept of authority at all, god is not a person, but a universal soul or something of that kind.