The Universe supposedly began as a point of infinite curvature of space-time, so why not something from beyond that. Also, while you point out that I have no more support for the acausal universe than the causal universe, you do not give any positive arguments towards the causal universe. I also question how you so easily arrived at the conclusion that God is not an impossible being. Perhaps there is further data unknown to us that would prove otherwise. It is merely a new spin on the old theory of natural selection in some ways, but I still think that one cannot merely discard it.
Complexity theory is a bit harder to explain.
It's sort of a reverse in the reductionist method used in science in the past. And theory isn't really a good word either. It's more of a paradigm that a variety of scientists and others shift to occassionally to better explain things like self-creation.