Where did the X in Xmas start...
Christmas each year there are always those who loudly decry the use of the abbreviation "Xmas" as some kind of blasphemy against Christ and Christianity. This concern has been elevated recently with the public debates about manger scenes and the substitution of "holiday" for Christmas in stores and government venues. Among religious folks, the objection to Xmas is usually along the line that people have taken Christ out of Christmas and replaced him with an unknown (since the Greek letter chi, [C,c] which looks like the English letter x, is the symbol for an unknown quantity in mathematics).

The exact origin of the single letter X for Christ cannot be pinpointed with certainty. Some claim that it began in the first century AD along with the other symbols, but evidence is lacking. Others think that it came into widespread use by the thirteenth century along with many other abbreviations and symbols for Christianity and various Christian ideas that were popular in the Middle Ages. However, again, the evidence is sparse.

In any case, by the fifteenth century Xmas emerged as a widely used symbol for Christmas. In 1436 Johannes Gutenberg invented the printing press with moveable type. In the early days of printing typesetting was done by hand and was very tedious and expensive. As a result, abbreviations were common. In religious publications, the church began to use the abbreviation C for the word "Christ" to cut down on the cost of the books and pamphlets. From there, the abbreviation moved into general use in newspapers and other publications, and "Xmas" became an accepted way of printing "Christmas" (along with the abbreviations Xian and Xianity). Even Webster’s dictionary acknowledges that the abbreviation Xmas was in common use by the middle of the sixteenth century.

So there is no grand scheme to dilute Christianity by promoting the use of Xmas instead of Christmas. It is not a modern invention to try to convert Christmas into a secular day, nor is it a device to promote the commercialism of the holiday season. Its origin is thoroughly rooted in the heritage of the Church. It is simply another way to say Christmas, drawing on a long history of symbolic abbreviations used in the church. In fact, as with other abbreviations used in common speech or writing (such as Mr. or etc.), the abbreviation "Xmas" should be pronounced "Christmas" just as if the word were written out in full, rather than saying "exmas." Understanding this use of Christian symbolism might help us modern day Xians focus on more important issues of the Faith during Advent, and bring a little more Peace to the Xmas Season.

From Gail and His Knights Merry XMAS!

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http://www.cresourcei.org/symbols/xmasorigin.html