most times merry Christmas but,also say happy holidays use both.
And that's what I do. I use both--or rather, I use all three (if I count in Season's Greetings as well).
And whenever people say "Jesus is THE reason for the season", I always correct them by replacing "THE" with "A", because as I've said time and again that "Jesus is A reason for the season, Santa being the other".
As I've pointed out, how can you celebrate Christmas without Santa? Not all of us are Christians, but we all celebrate Christmas with Santa--or St. Nicholas--whichever floats your boat.
"Who would imagine, who could imagine, who would imagine a king?"-Whitney Houston, The Preacher's Wife, 1996