Tomorrow is Christmas. Merry Christmas! If you actually celebrate something different, you should not be offended when I say "Merry Christmas" to you - all it means is that I want you to enjoy your holiday, whatever it is that you celebrate. Or, that I want you to have a happy Friday, since whether you celebrate it or not, tomorrow is Christmas.
Lately I've been seeing more intolerance in the other direction. People saying, "I'm sick of this 'Happy Holidays' crap - it's Christmas!" Well yes, it is, but there are also a lot of other holidays celebrated this time of year. If you choose to say "Merry Christmas", that's great and people should not be offended, but at the same time, if someone else chooses to say "Happy Holidays" or anything else, you should not be offended either. The only appropriate response to any holiday greeting is, "Why, thank you, and the same to you."
Also...
Abbreviating "Christmas" as "Xmas" does not "take Christ out of Christmas". In Greek, X means Christ.
"Santa" is not an anagram for "Satan". It means "saint", as in "Saint Nicholas".
So, lighten up, unbunch your panties, and Happy Hanuramakwanzmas! 