This entry was published at least two years ago (originally posted on May 15, 2019). Since that time the information may have become outdated or my beliefs may have changed (in general, assume a more open and liberal current viewpoint). A fuller disclaimer is available.
Book thirty-three of 2019: A Case of Conscience, by James Blish. ⭐️⭐️⭐️ 1959 Hugo Best Novel
Kept my interest, though I’ve read other SF dealing with the intersection of religion and SF that I enjoyed more. Almost two separate stories; the first section was the better.