This is just begging the question though. There is no reason under that reasoning to go beyond the universe. There is no evidence that the universe came into being so we can just as easily say the universe is the uncaused first cause.
Let me put it this way.
The main line of "evidence" for the Big Bang is...that the universe is expanding--and that the expansion is slowing down. Extrapolation of this model in reverse led to the theory.
The logic Law of Cause and Effect demands that something that
does begin, such as a Big Bang, had to have had a cause. Now, whatever combustive proccess started the Bang, if we were to reverse it, should, in theory, decrease in intensity until we reach the stating point, before which, apparently, whatever the "proto-universe" was was simply "there".
But whatever the procces was that started the Bang had to, in turn, be caused by
something. If God were to be removed from the picture, the logic of this reasoning would demand that this procces was caused by another, and
that by another, and that by another again, on and on, ad infinitum....
Thus, there are three possibilities, all of which are, frankly, logically consistent with the evidence:
1. An infinite universe, which always existed in some form or another.
2. A finite universe, created by a natural intellegent designer, who in turn was created by another natural intellegent designer, etc.
3. A finite universe, created by a
supernatural intellegent designer, who is infinite, and outside the bounds of time and space (both of which were created by said designer).
People of religion (such as myself), choose option 3, as, under Occam's Razor, the simplest answer is usualy (until you can prove otherwise) the most rational one to have.
We have the advantage of actually seeing and studying the universe while we can't [study] God. Further it is a leap to go from "uncaused event" to "God". There are scenarios in which it is entirely logically possible that the creator of the universe is a finite being who might be dependent on another higher being.
Perhaps. Perhaps not.
BUT...what
is certain is that there is no evidence
against it, either--which means that the hypothesis
is worth looking into, rather than dismissing out of hand.