Every year certain people are compelled to prove their religious righteousness by accusing pagans and secularists of taking Christ out of Christmas, turning Christian's most important holiday into Xmas.
It could be more innocent. Xmas might have begun as a romantic and goofy pun based on sound. X stands for Kiss in signatures and Kissmas does sound a little bit like some loopy romantic's intentional mis-pronunciation of Christmas.
Or it could be Satanic.