Actually, it's just the opposite. That thing that looks like an "X" is the Greek letter "Chi," the first letter in "Christ." The "Chi Rho" is an ancient Christian symbol, still found in many churches, and is the "CHR" in "CHRISTOS."
Now, if we can just get more churches to put the "Mass" back into "Christ Mass". . . .
While my freeper nick uses those letters they weren’t from that but I did find it cool. I knew about and it also predated a certain OS from a certain company based in Redmond Washington.