How does A Discourse Concerning the Mechanical Operation of the Spirit criticize religious fanaticism?

In A Discourse Concerning the Mechanical Operation of the Spirit, Jonathan Swift utilizes satire to ridicule the worship and preaching styles of religious enthusiasts during his era.1

Swift, who championed rational Anglicanism, viewed religious fanaticism as a threat to reason and common sense. By framing the "mechanical operation" of the spirit as a physical or physiological phenomenon rather than a divine one, he mocks the irrationality he perceived in Nonconformist practices. This work, published alongside A Tale of a Tub, serves as a critique of the "gross corruptions" in religion that he believed stemmed from the abandonment of intellectual faculties in favor of zealous, unreasoned fervor.1