The Big Bang is a theory, one theory, not the only theory, regarding the beginning of the Universe. Whether or not I believe it doesn’t make it true or false. So if you want to use it to prove to me god exists, you’re using a theory to prove god exists. I don’t think that’s a very good argument. If you want to use it as evidence that god exists, again, I don’t think that’s a very good argument.
Recently some cosmologists and quantum theorists have put forth some strong math suggesting the birth of our universe was immediately following the total collapse of the previous one. It’s as plausible as any other theory.
The view from the HinduPuranas is that of an eternal universe cosmology in which time has no absolute beginning, but rather is infinite and cyclic, as opposed to a universe which originated from a Big Bang.[13][14] However, the Encyclopædia of Hinduism , referencing Katha Upanishad 2:20, states that the Big Bang theory reminds humanity that everything came from the Brahman which is “subtler than the atom, greater than the greatest.”[15] It consists of several “Big Bangs” and “Big Crunches” following each other in a cyclical manner.
It would seem to me that time, as we know it, has to begin somewhere. But then again… What does infinity point to? I believe it was Aristotle who called it the uncaused cause.