You've probably heard the phrase "Keep Christ in Christmas," either on a church sign, or a Facebook wall. You might have even heard it this month. The idea is always the same: let's not rub out the religious roots of this holiday by saying "Xmas," instead of Christmas.

This might seem like a strange battle to wage, but there are people who really, earnestly believe this is deeply important. For instance, Franklin Graham, son of Billy, put it like this:

For us as Christians, [Christmas] is one of the most holy of the holidays, the birth of our savior Jesus Christ. And for people to take Christ out of Christmas. They're happy to say merry Xmas. Let's just take Jesus out. And really, I think, a war against the name of Jesus Christ.

This is of a piecewith those who fret that saying "happy holidays" is somehow scrubbing the season's religious ties away. But those who make this argument are barking up the wrong tree, because, you see, the X in "Xmas" literally means Jesus. Allow us to explain...