This is an excellent, sympathetic biography by, I am sure, a Christian (Jacobs is an English professor and director of the Faith and Learning Program at Wheaton College in Illinois).
Lewis notes that some disputes about doctrine are not resolvable and/or don’t matter for us (214-15), a point I make elsewhere on this site.
The closing quote of the book (and quoting Lewis) ends with the words “…news from a country we have never visited” — sounding a lot like Walker Percy’s “islander” (and the longing — the feeling that something is missing — is another Percyesque theme with Lewis).
Lewis is a very admirable man in his personal life, his loyalty and dutifulness, etc. Very hard-working.