This’ll be stretching it a bit. Ok, I saw this science-fiction novel in a second-hand book store in the late 1980’s. I cannot remember its title or author, but from what I recall reading the back of it, the Protestant reformation never happened, the Church became all-powerful and eventually discovered space travel. The story was set on a giant starship. That’s about all I can remember, it wasn’t “The High Crusade” by Poul Anderson as I have that book.
Any help would be appreciated. Thanks in advance.