Kitty has had such a ball being in on the big secret of Santa, I can't help but think it will contribute to her being a religious skeptic. Her personality is definitely oriented toward wanting to be right, in the know, and a keeper of knowledge. She adores being proven right when we disagree about something. And recently I had to pull her aside several times at a friend's party because she kept interrupting his Grandpa's magic show, yelling, "I know that's just a trick," and such. (A good opportunity for discussing the intersection of politeness and skepticism!)
So many people seem to think they are special, in on a secret, especially wise, or gifted because of their religious beliefs. I'm glad my daughter has a foundation for feeling these (admittedly sometimes venal) emotions as inspired by knowledge about the natural world, skepticism, and inquiry.