Dear RevCrossHugger
As usual, I haven't had time to read all the posts, so apologise if I repeat any previous replies:
You are right that there may have been a cause for the Big Bang, but you are wrong to imply that your answer is in any way scientific. Scientists are carrying our experiments to try and work out what happened at the time of the Big Bang. Your approach is simply to shoe-horn "God" in as an answer. Therefore, you are already pre-supposing the existence of God (whatever that is), which does NOT prove the existence of God.
There are 2 main problems with your proposition:
1) If, as you say, everything has a cause, then you need to explain what caused God.
2) You need to define what "God" is.
I have a particular issue with the 2nd problem. The word "God" MEANS something: it is understood by most people to be an intelligent entity of some sort, with certain characteristics shared by humans, that created the Universe, and is derived from Stone/Iron Age myths. (They have to be myths because there is no way people in the Stone/Iron Age could have had a better insight into what created the Universe than we do today with all our advanced technology and communications.) If the Big Bang were proven to be caused by some kind of non-intelligent physical force, you can't call that "God". You have to adopt a different word or phrase to describe the process that caused the Big Bang.
Even if some intelligent entity did create the Universe via the Big Bang, the chances of it being anything like the "God" of ancient myths - or even of more recent myths - is effectively zero. So to call the cause of the Universe "God" is still grossly misleading, unless you have any actual evidence to support your hypothesis that the creator resembles one of the many gods we have invented.
But then we still go back to the other issue: what caused the cause of the Big Bang? If something caused the creator of the universe, and something else created the creator of the creator, etc, etc, you can never call any of them "God" as we understand it because there would be no original creator.