Whether you're a Christian or not, the fact is America has a Christian heritage. While I understand if you don't want to wish someone a "Merry Christmas," I don't think anyone should get offended if they are given a Christmas greeting as opposed to the more politically correct, "Happy Holidays." You're in America. Things change and progress and we become more open-minded and accepting of all cultures, and that's all good, but most of us still like to feel the warm fuzzy feelings of patriotism and our nation's founding principles. I feel like anyone who gets offended by this historically Christ-centered holiday (Easter too) is just looking to stir diversity.
So Merry Christmas, and all that that implies.
P.S. I totally stole that quote from a TV commercial, but since I only heard it and didn't see it I don't know what the ad was for. I was shocked it was on TV since it's really so controversial, but it has given me something to think about.