I think to this day the biggest logical "proof" for god was presented by a staunch Atheist - Aristotle.
Aristotle presented the idea of the first "force" or as he called it the "first mover" but I will expand that logical argument with a simple statement. First there is no way to prove that God is in fact real or even exists, however for the sake of this argument god is a perfectly rational statement (note the capitalization, they refer to two ultimately different people.) There will always be an unknown quantity, whether we can in fact appropriate the first motion that brought about our reality, something will remain unknown and i present to you that "this unknown" is the "god" you are so wanting to disprove. This is not a faith based argument, rather something i consider a simple solution to an impossible equation.
Will we in fact "know" that god exists, first you would have to define what is knowing? Is knowing and believing so different. Everything we thought we knew is in fact some belief that we once held. The earth is round was a belief but it was dominated by the idea the earth was flat for centuries until we were able to prove beyond reason that the earth is in fact round? But is it truly if mass bends space time and earth is mass isn't there a dimensional factor of "roundness" that is missing in our "belief" that earth is round. Is believing then also knowing? and if knowing and believing are so similar and knowing is proving isn't there an argument for God to be real based on collective belief?
Knowledge is god, and the closer we get to truths whether through knowing or believing the closer to god we become. In the context of a game are we not god to every character in The Sims based on our knowledge that we exist and they exist solely on a computer screen? As we poor our "soul" into characters is that not akin to godliness? Have you watched the Ghost in the Shell? or I Robot? or the Matrix?
But ultimately, seeing as how your atheist I shall present a scenario for you. What if, with all your logical uncertainty of god, he does exist? Wouldn't it have been at least marginally beneficial to at least think he exists "knowledge of God is beneficial to every religion even satanism." And in the realm of scientific/atheistic thought isn't it always in one's own self-interest to doing something that is at least marginally beneficial to them in both the short-run and the long run?
Just something for you to think about.
