If anything saves my faith and keeps me from truly falling into atheism, it will be Christmas. I love Christmas. I know you don’t have to be Christian to love Christmas- it has a lot of secular underpinings these days, and it also has deep pagan roots. You don’t even necessarily have to be a Christian to appreciate the religious/sacred aspect of Christmas any more than you have to actually be a heathen to feel a deep connection to, say, Norse mythology.
But Christmas does something more to me. Maybe it’s the way I grew up, or my culture, or whatever, but I feel like Christmas has a gravity, a magnetism that is compelling and entrancing, in a way that I can only describe as deeply spiritual. There are emotional undertones below the surface, but it’s not the same thing as my classic Mormon mistake-my-emotions-for-the-Holy-Ghost. It’s big, It’s important.
If I felt about Christianity in general the way I feel about Christmas in specific, I would certainly be a Christian. As it is, I don;t know that I can let go of Christmas’s spiritual hold on me. If I reawaken to religion or just to spirituality, Christmas will be one of the tethers that kept me safely anchored.
Sailing to Byzantium 
I love Christmas too. I tend to call it a sentimental/nostalgic connection with the traditions, so maybe it’s simliar to your spiritual connection and maybe it isn’t.
I kind of relate to what you’re saying when you say “If I felt about Christianity in general the way I feel about Christmas in specific, I would certainly be a Christian.” Yet for me, this idea manifests itself in kind of the opposite direction, namely “Since I don’t feel any connection with Christianity, it actually kind of annoys me when people claim that the ‘true meaning of Christmas’ is about Jesus because I feel like the rich Winter/Yule festival tradition means something far bigger and more important than that.” That will surely be the subject of my 2007 Christmas post. 😉
For now, you can see what I wrote about Christmas back in 2005: Tradition!