Historically "X" was an abbreviation for Christos (sp?) in Greek or so my pastor told me. I figure that I have a right to write the entire word "Christmas" as I like. I also think that others have the right to not do so. Same thing with saying "Merry Christmas" - I'm a Christian and I use that phrase because it is meaningful to me. There is no reason at all for me to be offended by the phrase "Happy Holidays". Maybe the person saying that does not celebrate Christmas! I generally try to be more concerned with my own behavior that that of others.
Pam