We also celebrate Advent all month as well as St Nick's day where we learn about St Nick - but on Christmas morning, Santa Claus and his reindeer visit our house. I actually kinda believed in this fun little fantasy through 7th/8th grade.
As a mom now, I love that I can give to my children "in secret" as this is a Christ like model of giving that someday, my kids will be able to do for their own children. I now look back on Christmases of my youth and tearfully realize, that my parents were the sacrificial givers of those gifts I knew had to be from Santa because "there was no way they could afford it." That's Christ like love personified.
I whole heartedly agree with James Dobson's perspective on this and thought I'd send it along:
"Can Teaching Your Children about Santa Claus Interfere with Their Spiritual Beliefs Later in Life."
James Dobson: "I don't believe that those early, early fantasies really interfere with later Spiritual beliefs. I haven't seen any evidence of that, either in the life of my kids or in the lives of those I have had anything to do with. To allow a little bit of fantasy in a child's life enriches his intellectual life and I think he needs it. Children thrive on fantasy. It enriches our mental existence. Reality can be a pretty cold and hard place. I think children need the fantasy that Santa Claus, the Easter Bunny, and other childhood mythical creatures bring.
Dr Bill Maier: Childhood fantasies can be fun and help develop a child's imagination. As long as the fantasies are not unhealthy, there is no need to "correct" your kids any earlier than necessary"
For this same commentary in audio form here is the link: