While not as inventive as some of Big Finish's more outlandish stories (ex: "The One Doctor"), "The Church and the Crown" is an engaging story, with enough twists, turns, and political backstabbing to keep the plot moving at an impressive clip.
The team of Peri, Erimem and the Fifth Doctor continues to delight, with Erimem's practicality balancing out Peri's high-strung tendencies. That being said, Erimem is no wilting flower, showing both her charisma as a leader (when rallying an army of French soldiers), and ruthlessness (advocating the immediate execution of the villain). Only time will tell if these traits will be examined further.
Big Finish turns out extremely well-written historicals, due in part to the fact that they are not hampered by special effects budgets. However, there was nothing particularly innovative about "The Church and the Crown," nothing to make it stand out among the other well-written stories of this type.
Ultimately, "The Church and the Crown" is a fun diversion on a Sunday afternoon, though it doesn't encourage repeat listening.