Why not just say there is absolutely no evidence for god and leave it at that?
Because that is absolutely NOT the same thing as saying "God doesn't exist". There lies the fallacy. I agree with you on the lack of evidence. But that only proves the absence of the deity, not its inexistence. There's a logical leap on your reasoning that doesn't adhere to reality, and indeed is a spectacular claim that demands overwhelming evidence from atheists - as much as the evidence demanded from theists.
Eden