Hey, I don't believe in Jesus as a savior/am not Christian, but I set up a Nativity every year anyway. It's pretty, and it's a cute Christmas story to me, same as Father Christmas or Rudolph (for me personally, I hope that doesn't offend anyone because I understand it's obviously MUCH different to many people).
I think the majority of people in this country have a mashup of holiday traditions from different religious backgrounds.