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 intelligent designer, who is infinite, and outside the bounds of time and space (both of which were created by said designer).
One thing we should get past in this discussion is referring to the Big Bang as an explosion. I know its name and reputation imply that it was, but it is really an expansion of space-time. It is not exploding into space, it is creating space. Since there conceivably is no space or time outside of the universe your lack of cause and effect applying to God can just as easily apply to the universe.
I think in number 3 is where you really have problems. The very word supernatural has little meaning to it. It largely used to be used to explain natural phenomena that people had no explanation for. You are moving from the concept that the universe is contingent to God with a capital G because that's thee idea that pops into someone's head in the Western world when we talk about the creator of the universe. But there is a huge gap between getting to "something created the universe" and your intelligent super being. BTW since intelligence describes a relative ability to solve problems what does it even mean to say God is intelligent?