How did Persian Letters criticize French government and religion?

In his 1721 work Persian Letters, Montesquieu utilized the perspective of two foreign travelers to offer a sharp, satirical critique of French society and institutions following the reign of Louis XIV.12

Regarding the government, the novel highlighted the contradictions inherent in the French political system. By employing a narrative device that allowed for external observation, Montesquieu poked fun at all social classes and mocked the political climate of the era. His work reflected a spirit of iconoclastic criticism that challenged the status quo, setting the stage for his later, more formal analysis of political institutions and the separation of powers.21

The book also directed bold jabs at religion, specifically targeting Catholic doctrine and the papacy, which he famously described as an ancient idol worshipped out of habit. Furthermore, the text engaged with contemporary religious controversies, such as the dispute over the papal bull Unigenitus and its impact on the Jansenists. These daring critiques drew the ire of authorities but ultimately cemented the book's success and Montesquieu's fame.213