Maybe non religious people get annoyed by Christians acting like they own Narnia. Because there are lots of Christians who keep using the stories to try and push their beliefs, in ways that I’m betting would have driven the original author absolutely nuts (it didn’t work on him, after all). They’re pushing Narnia as a “witnessing tool” so much that they’ve forgotten Narnia doesn’t need their help. I mean, if the books are a metaphorical, child sized version of the author’s personal testimony, you might want to pause and take a look at how belief in Aslan and Narnia is handled in the books. The more you push, the more annoyed people get and the less likely they are to want to keep enjoying a series that so many obnoxious people are big fans of.

One of the secrets to the popularity of this series with children is the narrator’s voice, I think. It has a very “this is just between you and me” vibe. The books were a conversation between me and the author, not me, the author and five grownups standing behind me telling me how to interpret things.

So maybe it doesn’t matter if people are getting things “wrong”. especially if they are very young and have not yet filmed all of their character’s arc and so have not experienced everything that made him who he is.