SSolomon: I just find the superiority complex on both sides wonderfully entertaining. That driving need of the idiots and morons on both sides to prove their perspective as truth. When the simple truth is no one has a clue, not even the foggiest. Claiming there is no higher power is just as much a leap of faith as saying there is one. There is no proof either way, never will be any.
You can't prove for certainty, but you can point to inconsistencies and proofs that say one thing or another. Example: A man named Jesus did exist and was executed during the Roman Empire on a cross.
Carbon dating points the age of the Earth to be around 4 billion years old at least, where as the bible points as the earth being less than 40,000 years old. You can kill this argument about the earth's age immediately by pointing out that the second nearest star in the sky takes longer than that for its light to be visible for us, so by its placement (with a whole universe being made in a week) would give us a vacant, empty sky.
You can also point out a date when Christianity was first discovered as a roman religion, where as there are evidences of many others having existed for a far longer time. People will point to religious events, miracles, coincidences, so forth. But when you collect all the evidence, you have things we can't explain on the religious side, and things we can by the scientific community and historical evidences.
But, that's not the deciding factor for people. It never will be, even if you totally disprove the existence of god tomorrow, no matter how absolute the evidence, people are going to believe anyway because their bible tells them they must. And people who don't believe will not be any more content in the end.