It's mostly driven by money, Ref. The mass media in the western world publicize whatever causes people to run out and spend the most money, and that means they will publicize Christmas, not Ramadan or Hanukah. Do they care about the religious or spiritual aspect of Christmas? No! But they do care about how much time people will spend at the mall frantically buying presents and stuff.

Why be so worried about Christianity when it's really just the trimming on the tree? The real religion these days is gross materialism, driven by conspicuous consumption. Consumerism, it's called. They have the gall to label us "consumers". What a dehumanizing term that is.

So what did you choose to do on Buy Nothing Day? ;-)