The Christian allegory nature of Narnia went completely over my head when I read the books as a child. I was raised Methodist, went to church every week, knew about Jesus, all that jazz, and totally missed who and what Aslan was supposed to be. In fact, I misread the books so badly that they accidentally became the impetus for my first early fumblings with the ideas of polytheism and nature worship. It was very "Aslan is clearly a god, and he's obviously not Jesus because he's a big talking lion and they would have told me in Sunday School if Jesus was a big fuckoff lion, so there could be gods that aren't Jesus. And also here's Bacchus over here, that's cool, tell me what a naiad is again?" This was all very formative.

And then I reread the books later throughout my childhood, with a much greater understanding of how symbolism and allegory work and realized that they were Christian as hell (if you'll pardon the pun) but it was too late - C S Lewis had already made me a pagan.