I am not religious, but I love Christmas. That is, the heart of Christmas, treating people well, family, friends, food and drink, the giving and receiving of gifts, and of course the memories going back to childhood. So, Christmas can be merry without all the other stuff weighing it down. Anyway, it shares it's roots with other festivals and such that predate the modern Christian stuff.
Plus common, you have all the classic specials like the old Rankin-Bass Rudolph the Red Nosed Reindeer and the old Grinch that Stole Christmas.
http://youtu.be/PgHCZWoMwm4 http://youtu.be/ZgP0aUKlmNw