Richard Dawkins is an evolutionary biologist at Oxford and an atheist. He is the author of the best-selling book, "The God Delusion" which as of this writing is number 6 on the New York Times bestseller list. He said this when asked by the NYT about his own philosophy toward Christmas and the use of "Merry Christmas" as a seasonal salutation:
" So divorced has Christmas become from religion that I find no neccesity to bother with euphemisms such as happy holiday season. In the same way as many of my friends call themselves Jewish atheists, I acknowledge that I come from Christian cultural roots. I am a post-Christian athiest. So, understanding full well that the phrase retains zero religious significance, I unhesitatingly wish everyone a Merry Christmas."
So, Merry Christmas everybody!