Evidence against is obviously a tricky business, as I know you don't have any evidence against the Chicken overlord theory.

I believe the correct process is to start from a blank slate, and Christianity assumes too much to start needing evidence against it.

BTW, there is lots of circumstantial evidence which I believe sufficient to discredit it. At each stage the church seems to back down or change its story, claiming something is now taken to be metaphorical rather than literal. Presumably if atheism could be proven, the church would say they knew all along that the God discribed in the Bible was a metaphorical reference to human spirituality and they never claimed he was a real entity.