Strictly speaking, much of the trappings of the holiday season have quite a bit to do with the holiday's source... pagan winter solstice. (After all, the days are getting longer again so it's not fimbulwinter) Much of what people see as "Christmas" got pulled over from Yule, which people conveniently forget is NOT a Christian thing.

*shrug*

If it makes people happy, why should I shit on their parade?