remark:this is not bashing christianity.
Most Helpful Girl
I don't think it has anything to do with Christianity. Kids of all religions and non-religions grow up believing in Santa. My best friend is Hindu and her little sister believes in Santa. It's a cultural thing, not a religious thing.
That aside, I don't actually remember believing in Santa. I know I did, but I know I rationalized it way earlier than I admitted to my parents. I figured it out pretty young because in the movies the parents never believed in Santa and it only made sense that they'd know for sure because it was either Santa or them putting out the presents so I dismissed the Santa thing at a very young age. I didn't tell my parents I didn't believe in Santa until I was about 10 because I was afraid that they'd give me less presents than my brothers if they knew I'd stopped believing. Though I do remember one time in like first grade I shared my reasoning with some of the other kids in class and I made them cry and I got sent to the office and I begged the secretary not to tell my parents what I said because I still wanted presents and she must have thought it was cute so she didn't end up telling and just sent me back to class.