Found this on an evangelical website. At first, I have to admit, I thought it was a parody, but I don't think it is. Incidentally, the "X" in "X-mas" is a chi, which is the first letter of the Greek word Christos. Early Christians used the Chi-Rho (which looks like an X and a P superimposed on one another, also known as "the monogram of Christ") as a symbol for Christ, and the so-called "Jesus fish" is based on the acronym iota-chi-theta-upsion-sigma (for "Iesous Christos Theou Huios Soter," or "Jesus Christ, Son of God, Savior").