Christmas is the melding of great myths. Jesus and Santa are big a plus many other small traditions, particularly those pertaining to the northern solstice, thrown in from various cultures.
For many modern families in the developed world the story of Christ is just another fantasy story from an old book. Moreover,modern life is large, leaving little room for religion even for the notionally faithful.
Neither do they tell their children that a man in a red suit flies in on sleigh drawn by flying reindeer.
As religion continues its current trend toward increasingly ridiculous anachronism the only thing that will save Jesus and Santa will be the celebration of the ancient rite of the solstice. It was woven into the fabric of our existence as as species by our four billion evolution in its presence.
Call it Yule, call it Christmas or whatever we know it is and always will be the northern mid winter festival.