I really like the depiction of the cardinal. The author seems to have a pretty good idea of how religious fanatics like to twist logic "in their favour". Also you can clearly see the fear on the cardinal's face. Consider page 9:
"There's a rumor that Fushi can resurrect the dead..."
"... if he is a demon, he will not be able to resurrect the sage."
"On the other hand, if he is under the protection of god, then he should be able to perform such a miracle here, before our very eyes!"
Let's first identify the baseless assumptions: 1) a demon would not be able to resurrect the sage, 2) if one is under the protection of god he can resurrect the sage in front of everybody. Note that the second argument also implies that none of the church is under the protection of god. And if the same lapse in logic is used as for the conclusion, that they are all demons.
Let's assume for a second that these assumptions are true however.
Then if he cannot resurrect the sage then he is not under the protection of god, however, this doesn't imply anything about him being a demon. From the assumptions, not being able to resurrect is a necessary condition for one being a demon, but it's not sufficient. Note the intentional false dichotomy. The lord however buys into this since he arrives to the conclusion that "he's an agent of the the devil".
The author definitely did a good job with this. This is a very good illustration of the idea that the most tragic and evil deeds are born not from malice first, but rather from stupidity and fear.