There is a common saying "absence of evidence is not evidence of absence", and I wonder if that runs through people's minds when they talk about the lack of evidence for god?
Standing on it's own, it's a pretty fricking silly saying. If you exist, you leave evidence you exist. It really is that simple. Carl Sagan used the term to label "an argument from ignorance". ie., "well, I don't have any evidence He.she.it doesn't exist, so I am firmly convince HeSheIt does exist".
You can't prove a negative, but you can sure build a mountain of shallow god-talk out of a molehill of mystery. And if your god-talk's got game, you can even get other people to think your idiocy is wisdom, maybe even pay to hear you blather or read your book or kiss your pinky. Foolish things of the world indeed. I don't think I need to list examples.