Absolutely. It was written back in the forties so of course the style and format can seem rather stilted to us now. At some points they're more essays than stories. As you probably know, CS Lewis was an intensely religious man. The Trilogy involves the retelling of the battle between good and evil on Mars (first book), Venus(second book) and finally Earth (third book). When I say battle though it's mostly a battle of ideas and words and individual choices, not armies.

The trilogy makes reference to some of Tolkien's work and imo must have been an influence on later writers like Madeleine L'Engle. Each planet is ruled over by a being who is effectively an angel. Our "angel" is bent (evil). Lewis was keen on showing the essential ugliness and banality of evil so he spent a lot of time discussing just that. The final book in some ways foresees our society today, where feminism, rationality and the needs of the many outweigh naturalism, religion and individual choice. Lewis very much thought this would be horrible and ultimately satanic. YMMV on all this of course.