So you plan on only allowing non fiction films and books into your home?
We don't do Santa, Easter Bunny, Tooth Fairy or Halloween in our home either, although we tell the stories or cultural traditions they are based on we made sure they understood that these were traditional stories. I've never understood the point of tricking children into believing an untruth. Has caused social issues when the radical children blurted out the truth to other children a time or two.
Lewis's stories are just stories, too, but they are grand stories with good morals that hint at a deeper truth. Cultural literacy is as important as history, math and science. You have to choose the stories you plan to impart cultural literacy with and Lewis is far superior to the PC crap churned out in children's lit these days.
Just my two cents.
Of course I enjoy non-fiction. I do however avoid any occultic/magic stories. The Lord is very clear when he says to avoid such stuff and I think he knows whats best for my family and I. There was a time in my life that I enjoyed such fare, but after reading the Bible and learning the truth I know better. When one finally knows the truth, its easy to spot a lie.
One point in the Lion the Witch and the Wardrobe that was a lie was that the Witch demanded the sacrifice of the Lion. I've gotten alot of emails (you know the ones that say if you don't forward this you must not love God)that say the same thing (that Satan demanded Jesus to pay the price). That is just a lie. Jesus does not answer to Satan. It's sad though that when we point this out to the Christians that send us those emails they just blow it off - you know cause it had such a "good" message and such cute little dancing bunnies or whatever in the email.
So I'm not in a rush to go see/read more CS Lewis. If I bite into a piece of fruit and it's rotten I don't finish eating it to see if there's any good part of it.