True story: when I was little and started reading the Narnia books, my mom sat me down and explained that they were very good books, but they were about a different religion than ours, so when I was confused by the Christian parts, I should come ask her and she’d help me understand them. I then spent my first reading of every single book thinking, “What’s she talking about? There’s no Christian stuff in here. I like lions, lions are fuzzy!”
I think it was a few years later that I reread the books and realized THE LION IS JESUS. Duh.
I didn’t happen across His Dark Materials (which you may know as The Golden Compass books) till about ten years ago, but I imagine that would have been a FASCINATING mother-daughter convo.