I grew up with these books and as I kid I was never particularly troubled by them (I recall I was probably about 9/10 when I read one of the later books - Voyage of the Dawn Treader - before I clicked about Aslan being Christ. And that was only because he suddenly appeared as a lamb...)
Anyway, thanks to the movie and the tie-in re-promotion of the books, there is a lot of comment about Lewis, his religion and the Narnia tales (here for Alison Lurie's rather generous, but reasonably balanced view; here for letters from the Observer on the topic, and here for Polly Tonybee's rant - and these are just the most recent from the Guardian/Observer).
Overall I guess I would say I'm ambivalent about these books: with an adult's eye they are undoubtedly deeply problematic - 'Muscular Christianity' indeed. But I did wince a lot reading PT's diatribe and wondered if she was writing polemic for its own sake?
And oh yeah: as much as I love Tilda Swinton and think she probably is magnificent as the Witch, she should have DARK hair as per the books...