I believe in the possible existence, or former existence of God.

I lean more towards the Big Bang Theory, and rationalize that God created the mass/energy that caused it all to begin with. The Universe is expanding, and there is the distinct possibility that our Universe is not the only one in the void of space. We may never truly know.

As to the question of how God came into existence (if He truly exists), the answer is unfathomable to us, as He cannot have always existed, nor can He have "willed" Himself into existence, as there would have been no "existence" without His creating it.

I digress. I would go on about this subject, but that is not the intention of this thread.