@Robert Gentel,
This again is ignoring the possibility of a third category though -- not true, not false, but fantasy.
My kid is quite the skeptic in general -- you should hear her dissect tempting commercials.
However, she loves Christmas.
As a bit of a test (and also because I had no other good options, forgot to buy new "special" paper this year) I used the same wrapping paper that she referred to as an indication that there isn't REALLY a Santa as the wrapping paper for Santa's present again this year -- not a peep from her. ("Oh, there's Santa's present, I didn't see it before.") And she participated even! We put out fruit, eggnog and cookies at bedtime -- strawberries and cookies were nibbled but the banana was left alone. In the morning, before everything commenced, she ate the banana and said Santa did. Also, her thank-you's betrayed that she knows it's us and not Santa.
I was completely neutral this year about Santa, just followed her cues. Oh, you want to put out cookies? OK. Etc. She was entirely the engine this year.
Anyway, I do think that at some point if you go to great pains to "prove" to a skeptical child that Santa exists it'll be disillusioning for that child to find out that in fact he doesn't. But I think there's a lot more room for
play than in your scenario. Especially, I disagree with the notion that engaging in Santa rituals and play means a "discouragement of skepticism in a culture," in general. I think it
can be done that way but isn't
necessarily that way.