The US wasn't necessarily founded on Christianity, a few of the founding fathers happened to be deist/atheist/agnostic

Good luck ever finding that out in history class. You could say it was founded on the basis of Christian moral laws, but what decent human being doesn't abide by them already? This nation was founded on strong belief in secularism and freedom of expression, whether you happen to be Buddhist, Satanic, or even a Scientologist(lo-fuckin-l).
I am essentially atheist, still working it out, but I really don't give two shits whether or not we get a holiday. I'd prefer getting Christmas presents, it's much more satisfying. The only thing I would like to see is TOLERANCE for our beliefs.