At this late date, March 2010, I'm not sure this post is being visited much; but, your posting deserves a comment or two.
The "concept" of God is a function of the human brain; but, it is reasonable to believe that if there was no God, the concept would not be in the human brain: No God, No Creator, so how did I get here" People who would profer notions that we simply involved have their heads in the sand. Take the following exercise, for example: "Why is there something rather than nothing?"
If you will observe what surrounds you, you will note that there is "something" and "life" throughout our planet. The reality "something" exists now is sufficient evidence for one to conclude there has always been "something." This is so because if there had ever been a past instance of non-existence, that state of nothingness would have prevailed and there would be nothing today. However, "something" IS reality now ergo there never was such an moment of non-existence, nothingness. We know this is truth inasmuch as "something" cannot possibly derive from "nothing." Likewise, "life" is, as well, an eternal reality; there could never have been an instant of non-life or there would be no life today. We know this is truth inasmuch as "life" cannot possible proceed from non-life. And, as to Darwin"s "The Origin of Species," any scientist with good sense knows it is impossible for a qualitative lesser to evolve or become a qualitative greater!