I've seen this question pop up a few times so I would like to address it.
To be clear, I don't really identify as an atheist per say, but I am close with several atheists although I myself am undecided. That being said, here's my answer to "Do atheists celebrate Christmas?"
As a non-christian (something I definitely am) married to an atheist (which he definitely is) we still celebrate Christmas.
In fact, my atheist husband is super excited about Christmas and has been blasting Christmas music since November 1st. All kinds of Christmas music, yes, even the religious songs.
You see, we still appreciate the tradition of christmas. We appreciate the "story" of christmas. We just believe it's only that- a story. Mankind has been entertained by fictional stories since. . . well. . . forever. Just because we believe the story is fiction doesn't mean we can't enjoy the myth and the tradition of the season.
That's why I have no problem with nativity scenes, Christmas hymns, talk of a savior etc. To me, it's just fiction. I realize it's much more than that to some people- that's their personal choice and belief and I respect that 100%.
However, because I don't believe it's *truth* does that mean I am not allowed to celebrate?
Not to mention, the Christmas holiday is so much more than celebrating the arrival of a savior. It's evolved into time spent being generous to others, time spent with family, a reminder to show those in our lives that we appreciate them and love them. I think it's wonderful to have a tradition where we celebrate the goodness in each other.
Are there atheists who don't celebrate Christmas? I'm sure. I've also met CHRISTIANS who don't celebrate Christmas. It's a personal choice for each individual to make regardless of whether they believe the nativity story is truth or fiction.