And there is NO proof of God's nonentity.
Actually if you think of humans and human brain,Universe,Earth,Creatures,that will lead you to a simple idea witch is "Who created this universe",This question is more logical than "This universe is created by it self or by no one".
If you pay some attention your question makes three assumptions: 1/ that the universe actually came into being at some point in the past, 2/ that there's some agent that made the universe come into being, i.e. a cause external and independent from our universe, 3/ that that cause could be addressed as a "who", i.e. as a conscious being.
The first assumption seems to be true, based on the big bang theory. However, the big bang theory does not rule out other possibilities in which our universe would be infinitely old, either by itself or as part of a multiverse.
The second assumption seems to be true by virtue of the causality principle. But let me remind you that all of our rules, principles, knowledge, you name it, is inherently linked to our experience within our universe (the observable part of our universe to be more accurate). Causality (that each event has a cause that preceded it in time, and each object has an origin) seems to apply perfectly
within the universe, but to apply it to the universe itself would be totally unscientific, as there's no evidence suggesting the existence of anything beyond our universe/multiverse (remember, you were using that argument to try to prove such an existence, so it would be utterly nonsensical to start by assuming it).
The third assumption has no rational basis and poses more problems than it solves. First of, we humans are the only conscious beings that we know. Consciousness is defined by the potentials of our brains and the operations they perform, thus any mention of other "conscious beings" would probably be a form of anthropomorphism. Second, a conscious agent would require an explanation as to how it came into being. Did it for example evolve following a process similar to the one that created our complex brains? More questions and hypotheses that we have no way to answer or verify by principle, since gods are supposed to be transcendent are metaphysical. Over and over I've heard the argument of the organization of the universe, and its intelligibility to the human brain, as a "proof" of an intelligent designer. What proponents of this idea seem to miss is that there's much more chaos in the universe than there's organization. Our planetary system for example did not come to its current relative stability from the start. There used to be over 20 planets whose orbits intersected one another's, and collided with each other, and the ones we see now are just the ones that survived that chaotic period of our solar system... and there are many more examples of chaos in our universe that I can provide... as to intelligibility itself, I think that's a direct implication of us being conscious beings. I define consciousness as a potential to organize sensory input into "comprehensible" structures that we call "information". The universe is "intelligible" simply because we are "conscious", and not because it is endemically so. In other words, the phenomenon of intelligibility arises when a conscious being interacts with its environment. There is therefore no reason to assume that it must have been made by another conscious being.