Col. I once felt the same way but then someone explained that X-mas is considered proper useage from a religious standpoint. see the following from Wikipedia:
"Xmas" and "X-mas" are common abbreviations of the word "Christmas". They are sometimes pronounced "eksmas", but they, and variants such as "Xtemass", originated as handwriting abbreviations for the pronunciation "Christmas". The "-mas" part came from the Anglo-Saxon for "festival", "religious event": Crīstesmæsse or Crīstemæsse.
The word "Christ" and its compounds, including "Christmas", have been abbreviated for at least the past 1,000 years, long before the modern "Xmas" was commonly used. "Christ" was often written as "XP" or "Xt"; there are references in the Anglo-Saxon Chronicle as far back as 1021 AD. This X and P arose as the uppercase forms of the Greek letters χ and ρ), used in ancient abbreviations for Χριστος (Greek for "Christ") (see Labarum), and are still widely seen in many Eastern Orthodox icons depicting Jesus Christ.