Generally around the Xmas season, my two typical rereads are:
- Terry Pratchett's Hogfather, a humorous and insightful fantasy in his Discworld series and involving the Disc's version of Santa, and more recently,
- Charles Stross's Overtime, a Hugo-nominated novella in his The Laundry series of Lovecraftian bureaucracy urban fantasy/horror tales, with this installment dealing with the obligatory office Christmas party in a world where The Things From The Dungeon Dimensions™ really are trying to take over (this is available as a free read online @ Tor.com and while it takes place after The Fuller Memorandum, does not contain any major spoilers for what really happened in that one, nor does this novella contain any gory content, IIRC)
Mind you, I'm an atheist living in what's apparently my country's most statistically agnostic city area and I tend to be more than a little cynical and burnt-out after listening to too much Xmas music in the shopping areas by the end of the year, so YMMV.