Get over it. I don't celebrate Christmas, never have. And I have never been offended by people wishing me a merry one, it's a silly thing to be offended over. And on one hand it opens the door to what could turn into a polite talk about ones beliefs if one is inclined to talk about it.
I do believe in God, but not in the same way many of you do. I don't care or mind what you're celebrating at this time Christmas, Hanukkah, Kwanzaa, Winter Solcitice, Saturnalia or Ramadan (sp? I'm not muslim either) Funny how so many religious holidays fall right around this time of the year. I don't observe any of them.