Jessey,
If I came across defensive I didn't mean to!
If you are Christian, then Christmas is very much a celebration of the birth of Christ. As our DS will be going to a Catholic primary school, plus we currently go to Catholic playgroup, I really believe that he will lean the true meaning of Christmas, as well as enjoying the excitement of Santa.
You really don't have to make up your mind this Christmas anyway, as bubba won't be here yet. So maybe wait until bubba is here, and then you can decide closer to Christmas next year.