You know what really annoys me? When intellectual timidity or laziness tries to pass itself off as "sophistication". As when Relativists refuse to face up to difficult philosophical questions, and somehow think themselves the better for it. Or when Agnostics proudly parade their non-committal as the only reasonable religious position, on the basis that the question of God's existence cannot be "proved" either way.
Belief may be reasonably justified on grounds that fall short of strict proof. After all, "you cannot prove a negative", as they say, but that doesn't mean we must always suspend belief. If one or the other option fits more coherently with the rest of our beliefs, then we may justifiably choose that option. Alternatively, we can appeal to parsimony, and reasonably reject the positing of a new entity simply on the grounds that there's insufficient reason to accept it.
Consider the Tooth Fairy, or an invisible intangible dragon in my garage, or a china teacup orbiting Pluto, or whatever. We can't prove they don't exist. So should we suspend belief? Of course not! We all know the Tooth Fairy isn't real, no matter that this knowledge rests on (fallible) justification rather than proof. The Tooth Fairy's existence would violate our naturalistic understanding of the world, and bloats our ontology unnecessarily -- it can be safely shorn away with Ockham's Razor.
So, my challenge to the agnostic: How is God relevantly different? Why suspend belief in that case, but not about the Tooth Fairy? And is it just the Christian God's existence you remain neutral about, or also Shiva, Thor and Poseidon? And what about the Loch Ness Monster, UFOs and alien abductions? Can you prove that Madame Psychic can't forsee the future? (What's that? You say you don't believe in astrology? *Gasp*! What presumption! You're just as dogmatic as those gullible horoscope readers! We true sophisticates never conclude anything one way or another!)
Many theists have personal reasons for believing in God (e.g. religious experiences), and I can respect that even as I disagree with them. But to recognize that there is no reason to believe in God, and nevertheless refrain from judgment, is entirely unadmirable. But hey, it's all "relative" anyway, right?