I loved 'The Jesus Incident' [0], which he co-authored with Bill Ransom - when I read it as a teenager in the 80s, it felt so 'adult' compared to a lot of the other science fiction I had read to that point.

I later read the prequel and did not like it. I never read the third book in the trilogy.

[0] https://en.wikipedia.org/wiki/The_Jesus_Incident