Christians love death at Christmas time. These two Christmas songs deal in the kind of mortality that is only hinted at in "Frosty The Snowman." He dies when the snow melts, but ominously proclaims that "he will be back someday." He doesn't even say when, and that's messed up.
You never hear about Santa dying in his sleep next to his Mrs. Claus and waking up in a cold embrace or a reindeer falling to their deaths in mid-air after an elf doesn't properly secure the reins in other secular songs, but Christians will make you remember death.
There's nothing like basking in the miracle of the birth of the Christ Child, our savior, to a virgin mother, and having a guy come up behind you and say "Yeah, well he's gonna get the shit beat out of him in like 33 years so you can have an affair with your secretary and not go to hell."
Mmmm, gingerbread cookies!