How does swift ironically criticize Catholicism?

Almost every satirical work in this collection deals with the matter of religious excess in some form, especially A Tale of a Tub and “A True and Faithful Narrative.” A Tale of a Tub portrays three brothers, who represent the three branches of Western Christianity, as all naturally licentious and without true religious conviction, having only outward appearances of conviction. “A Faithful Narrative,” too, portrays a largely sinful town thrown into displays of repentance when the people believe a comet is coming. “A Modest Proposal” mocks anti-Catholic religious prejudice, as the narrator calls the Irish babies “papists" because they are Catholic.