Christmas CHRIST'S birthday

Dear people who intently say "Xmas" instead of Christmas because of not believeing in Christ,the abbreviation "Xmas" is of Greek origin. Since the word for Christ in the Greek language is Xristos, which starts with the letter x, they started putting x in the place of Christ to come up with a short form for Christmas. I am aware that some people say it just to shorten the word and i used to but this is intended for the people who attempt to take Christ out of Christmas.