User blog comment:D.Ryan/Do you think they had Christmas in Rapture?/@comment-1330314-20101214173729

That's actually quite a good question. Imo, Andrew Ryan probably banned all the religious connotations to the thing, but most likely authorized some sort of substitute since it's good for business (lots of people buying stuff at the same time). Besides, you don't have to be christian (or even religious) to celebrate Christmas.