Unfortunately we mild mannered atheists are constantly being compared to Atheists like Madeline Murray O'Hare and Michael Newdow. People like that are activists. If they didn't have religion to fight against, they'd find something else.
Most true atheists simply don't care enough to do more than have a good argument on a message board. Agnostics, on the other hand, are believers in every sense of the word. They may not believe in any particular religion, but they all believe in a higher power. They just like to pretend it's an intellectual excercise. Sorry, but when even one agnostic out there can explain why I should hold the concept of God to a different standard than the Tooth Fairy, The Easter Bunny, and Santa Claus, then I'll call myself an agnostic. So far, none of them have been able to.
All agnostics are believers who know how dumb it is.