Yes, Lewis is one of my heros too (along with JRRT gws ( = goes without saying)), he said somewhere that his trilogy was strongly influenced by Lindsay's book.
There are also the novels of Charles Williams - in particular The Place of the Lion - these novels are even more 'religious' than those of Lewis but that depends how you read them, that doesn't bother me, some might say that they are quite old-fashioned but for me that just adds more charm.
And of course, as most people know, Lewis, Tolkien and Williams were friends and colleagues and members of a club called the Inklings.
- This may be a bit beside the point but in view of very recent events, it could be useful for some to read or re-read A Voyage to Arcturus to help reflect on what is the nature of evil and what we should do, or not do, about it.