Often, I hear people saying, “Why do you put an X in Xmas. X means an unknown quantity!” And so they berate those who write it. But, they don’t know what they are talking about. The Greek letter for “Chi” is quite similar to our X. Thus it is used as a shortening, abbreviation, of the first three letters of the title of Jesus, “Christos” which means Christ, of “The Anointed One.”

If people really want to complain, why don’t they object to the obviously Romanist term “mass” in the word “Christmas?”
But, again, there is little to object to if they do a little research on the origin of that word.