Time for Digi's 2 cents. I've browsed the thread, but 10 pages is a lot even for a stalwart...with luck, I won't re-tread too much ground.
-The burden of proof is, in fact, on the theists, whose hypothesis defies all observed and recorded phenomenon. But that doesn't also exempt non-theists from having to provide reasoning for their viewpoint.
-You can't prove a negative, and an absence of evidence doesn't equal evidence of absence. These are oft-quoted "hiding spots" for theists whose argument is solidly trumped. I usually take a subjective reality approach and claim that nothing at all can be proven, which throws them off and is amusing....but doesn't really hit my point. The better answer to such statements is that yeah, you can't disprove God. Nor the Tooth Fairy, nor Santa, etc. But you can perceive the utter lack of evidence for a God combined with rational explanations for every known phenomenon of the universe. Most of the evidence to the contrary involves either Biblical/historical assertions or paranormal anecdotes, both of which are debunk-able by an intelligent individual who is willing to look for plausible explanations.
The logical conclusion, then, is "no God". It's not proof, and never will be...but at that point, retreating to blind faith is in defiance of reason and becomes no less silly than a continued belief in sentient garden gnomes or Bigfoot. A belief in God might serve an emotional or social need, but it certainly can't serve an intellectual need.