His Chronicles of Narnia is for children (although adults can enjoy it as I did). For adults, he wrote the space trilogy. It is equally chock full of Christian metaphore, which is EXTREMELY unusual in science fiction.
BobJ was having a difficult time seeing the central appeal to the way children think and find this story "believable" and how they can easily accept the phenomena of entering an alternate world as Lewis scripted it.
I agree re the central Christian theme and would add that, as an adult, I enjoyed the movie immensely and found it engrossing.
I had never really thought about that. I suppose it depends on the reader / viewer. I don't have a problem with the concept.