Steve Zara has a nice article at RD.net that is actually saying the same thing I've been arguing at recent talks: There is no possibility of evidence to convince us of the existence of a god.
I propose a new strident atheism. No playing the games of theists. No concessions. No talk of evidence that can change minds, when their beliefs are deliberately placed beyond logic, beyond evidence. Let's not get taken in by the fraud of religion. Let's not play their shell-game.
The nature of this god is always vague and undefined and most annoyingly, plastic — suggest a test and it is always redefined safely away from the risk. Furthermore, any evidence of a deity will be natural, repeatable, measurable, and even observable…properties which god is exempted from by the believers' own definitions, so there can be no evidence for it. And any being who did suddenly manifest in some way — a 900 foot tall Jesus, for instance — would not fit any existing theology, so such a creature would not fit the claims of any religion, but the existence of any phenomenon that science cannot explain would not discomfit science at all, since we know there is much we don't understand already, and adding one more mystery to the multitude will not faze us in the slightest.
So yes, I agree. There is no valid god hypothesis, so there can be no god evidence, so let's stop pretending the believers have a shot at persuading us.