I'll tell you what made me think that: I asked the community if they had any good, non-strawman arguments for God, and the overwhelming response was "Nah, there aren't any."

I'm not sure if anyone's brought this up yet, but one of the site's best-known contributors once ran a site dedicated to these sorts of things, though it does of course have a very atheist POV. That said, even there the arguments aren't amazingly convincing (which you can guess by the fact that lukeprog hasn't reconverted yet) though it does acknowledge that the other side has some very good debaters.

I'm not sure why you think it's indicative of a problem with us that we haven't found good arguments for the existence of God. It's not a law that there be good arguments in favor of false propositions. I suppose you could make the naïve argument that if the position were as indefensible as it seems no one would believe in it, but unfortunately not many people judge arguments very rationally.