There is much unwarranted fuss about Xmas as 'taking Christ out of Christmas." Let me explain. In Greek, the language the New Testament was written in, the word for Christ is Khristós, (Χριστός). As you can see, the first Greek letter in the word Christ is a "Chi" or an "X". For centuries Christians have used the "chi" or "X", as shorthand for the whole word, Christ (Χριστός). So does everyone who writes xmas understand this? Probably not, but now you know and can explain it to them.