Well you could argue that the commercialised version of Christmas, the giving of presents, the drinking of booze... is itself a religion.
*looks smug*
Also the abbreviation "Xmas" has been around since the 18th century, derived from "X'temmas" from the 16th century. The title "Christ" has been abbreviated to "Xp" or "Xt" in religious texts since the 11th century. It derives from the fact that the first letter of the Greek word for "Christ" looks like an X. The misconception that it is part of the commercialisation and secularisation of Christmas seems to have arisen because "Xmas" was used in lots of advertisements, due to its shortness.
*looks smug*
Also the abbreviation "Xmas" has been around since the 18th century, derived from "X'temmas" from the 16th century. The title "Christ" has been abbreviated to "Xp" or "Xt" in religious texts since the 11th century. It derives from the fact that the first letter of the Greek word for "Christ" looks like an X. The misconception that it is part of the commercialisation and secularisation of Christmas seems to have arisen because "Xmas" was used in lots of advertisements, due to its shortness.