I would think it's been asked many times..
Can you answer it ? Just curious.
I, in fact, can give you my answer. It's the same problem that a theist runs into (which I guess I am) in that in common thinking, there has to be a cause for every effect. While an atheist my get a little lock-lipped at the question of what caused the big bang, and where that proto-matter came from, if a theist is asked where God came from he either
a) shouts "blasphemy!" and avoids the question
b) says he always is and was.
more on option (b) in a second.
Option (a) is as intellectually dishonest as an atheist's response of there being "nothing" before the big bang.
So both belief systems share a common problem, if one honestly looks at it. It's a problem of causality and time. For me, both perspectives on this common problem lead to the thought that perhaps the human perception of time as being linear is the real issue. Judeo-Christianic tradition indicates that God is not a part of space-time as we know it, and thus creation isn't really "moving through time," but rather we perceive it is because our own consciousness is based on a linear cognition of events. That still leads to a "how did this set up of God and all his creation get here?" question, but one could argue with the above in mind that it is clearly delving into concepts the human mind isn't equipped to really fully grasp.
Now, how is that any different from an atheist's view of things? Leave evolution out of it for now, because evolution isn't about the creation of the universe, but rather about the origin of species. Let's look at an atheist's view of the origin of the universe. For them, the "Big Bang" is the key event that caused an ever expanding universe to come into existence. What became before the big bang? There are some theories that the "Big Bang" is actually a re-occurring event, and after billions and billions of years of expansion, the universe rubber bands back into a single proto-mass, and has another "Big Bang." There are also theories centering around the concept that for every bit of matter in the universe, there is a bit of antimatter. Thus, there isn't really anything at all, as it all cancels out, and explains how the "Big Bang" doesn't break the laws of physics. I am not a physicist, so I am just trying my best to explain things as I understand them.
The point is, both come back to that same problem of, "how did this set up come about?" Even assuming that time isn't really linear like we perceive it, it is the same problem. There is no reason for someone to get high and mighty about their belief structure over another, because they all ultimately come to the exact same issues of unknown.