Starts like a pulp action story. Stays that way most of the time. Ends a bit too easily. In general I would call it 'Keith Laumer' style.
Short plot summary: the almighty church controls the world(s), using forgotten technology from eras past. A young monk gets tempted by an offering, and ends up running away / fighting the church.
It's all a bit 'coincidental' but that's the kind of story it is.
Note: I read this one in Dutch, but I doubt reading this in English would have changed my opinion that much 😎