Technically speaking, I celebrate Winter Solstice or Yule. But since most Christian Traditions come from Pagan ones, it's pretty similar. When people ask how I celebrate, I say " basically the same holiday, just a different Sun King." Oh, and I am not puking, as I don't have the flu. But I do have a head cold and feel pretty miserable right now. Hope those that celebrate it had a Merry Christmas.
You should say, "basically the same holiday, just a different Sun King....and sacrifices" then invite them over and laugh at their reaction.