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The page quote really seems more like The Fundamentalist or Knight Templar. Without some context (like the priest is not sincerely religious but just wants an excuse to kill people) I don't think it applies.
Having read it, I see that it's appropriate. However the context still isn't clear just from reading it.
I've added this example to the Webcomic folder with an explanation.
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How well does it match the trope?