dude, christmas was originally a pagan holiday, the christians jacked the date to make it a christian holiday. Kind of a petty thing to get pissed off about, anyway.
Although, I think being athiest is almost as stupid as being part of an organized religion. You have to explore science and spirituality for yourself.. If you haven't found god at least keep an eye out, you never know. If you have found a faith in something its ridiculous to be satisfied with it, you'll never know the answers in life, but you improve your ideas about it to better understand what you've grasped the more you explore it. The unshakable certainty of religions in their doctrines is what turns me off to them, personally. Well that and their attitudes about science, it just makes them look ignorant.
If the age of the earth is on a time line that runs from your shoulder to the ends of your fingers, life on earth starts at the beginning of your fingernail and all of human kind is represented by how much dust comes off the edge of your nail when you scrape it once with a file. I think our existence is incomprehendably less significant than we think it is. Hope I'm wrong though.