Two years ago (!) we at Daddy Dialectic had a very good, substantial discussion about whether kids need religion. (The original post was written by contributor Chip, who is now "retired" from blogging.)
The discussion continues. A fellow named Wes stopped by and posed some interesting questions: How do agnostics best approach the Christmas season and traditions with their children? At what age would you begin cultivating that appreciation of the differences between the faiths? At Jewish Community Center preschool (which my gentile son attends), if asked by another child if he is Jewish, what would your child say? And so on.
I confess that I've only given Wes some half-baked responses; I'm too distracted by holiday activities to come up with something coherent. But perhaps you, dear reader, have intelligent things to say? You can leave them here or revisit that discussion thread.