Well NYC, your argument is flawed. You're fine using public taxpayer funded resources for religious displays as long as they meet some vague and subjective criteria based on a combination of tradition, popular acceptance and kid friendliness.
Who exactly are "the Atheists"? Some kind of organized anti religion group? I've run into a lot of evangelicals from other popular religions, but Atheists are pretty damn quiet aside from pissing off the lunatic right wing fringe.