Believing in Santa was not acceptable to my Christian fundamentalist parents. However, they also had the excuse of being immigrants, so they implied (and perhaps it's even true) that believing in Santa was not common in their culture: "The children in this country think that Santa is real. I don't know why their parents want them to believe in fairytales!" I was never told to hide the truth from other kids, and I don't recall if the subject ever came up in my interactions with other kids. We still had Christmas gifts, a tree, sang Christmas songs, and even took pictures sitting on Santa's lap at the mall. I just understood that it was all for the sake of participating in fun customs.

I think the main result of this was to teach me to feel comfortable with being different. But there were lots of other things in my upbringing as well that had this same effect.