Maybe we should amend our FAQs to state that sweeping generalizations are not swanky and, therefore not alowed.
Bottom line here is that, we've got a lot of really wonderful people who are MORE that likely to take on a good, intelligent and provocative argument but to do so, there has to be a certain amount of respect for the beliefs of others here. Assholeishness is not really the way to go - although I think most of us do succumb at times.
My own thoughts on the atheist sign are this: It's bad marketing. It's boring. It lacks joy. It's certainly NOT going to win over anyone. Even I would choose a Christmas tree (or, gag, a manger) over an in your face burst of my joyous holiday bubble.