That was some of the worst logic ever. God exists and is omniscient and omnipotent because the universe exists and is a complex system? Who is to say that the Big Bang didn't happen because the previous iteration of the universe collapsed, then exploded, and that this has been going on forever, like the beating of a heart? That wouldn't require a God at all, just time and matter. It's human to assume there must be a beginning and an end to everything, but just because it's human to assume that doesn't mean it's true.

As for life, that too is explainable, without an omnipotent being. Let's say there is an X percent chance that the molecules necessary to form a simple bacterium will randomly hook up. X > 0, but could be a very, very, very small number. However small that number may be, if anything *can* happen, then given time, it *will* happen, no question about it. Once you have low-level life replicating, then evolution kicks in, survival of the fittest, best adaptability to environment, increased complexity, and so on. This doesn't require God either.

I'm not saying there *is* no omnipotent being out there. I am saying that you haven't even come close to proving there is. Since one can't prove a negative, it's up to the proponents of a theory to prove the positive...or fail to do so. So far, you have failed.