But Christmas is the celebration of the birth of Jesus Christ.
I agree cheese11 as I am a Christian.
However, you can celebrate whatever you want on Dec 25th, and many people choose to celebrate nothing with a fun but essentially meaningless exchange of gifts, gluttonous meal, wasteful expenditure of electricity, time off from work, fun with friends and family, and just sort of a feel-good time of year.
There's nothing wrong with all of that IMO, all of these things have their place and the celebration of Christmas by non Christians is simply a fun and sometimes debt-inducing tradition.
I don't hold it against anyone for celebrating Christmas even if they don't celebrate Christ coming to earth, however I get a little PO'ed when people call it Xmas, (I mean seriously guys, give Christians some credit-you wouldn't have Christmas otherwise)
As for me personally, I enjoy a lot of the commercial and social aspects of Christmas, but since the day holds deep symbolism to me, it means more to me than I'm sure it does to those who don't celebrate the religious part of Christmas.