Final answer:
Mark Twain critiques the hypocritical nature of religious institutions by depicting the king and the duke's con at a religious revival in 'Adventures of Huckleberry Finn'.
Step-by-step explanation:
By having the king and the duke pull their first "con" at a religious revival, Mark Twain suggests a critique of the hypocritical nature of religious institutions and those who manipulate religion for personal gain. Twain's satirical depiction in Adventures of Huckleberry Finn resonates with historical accounts such as those by Frederick Douglass, highlighting how religion was often used as a cover for exploitation and corruption, particularly in the context of slavery. The theme of deception intertwined with religion is paralleled in other literary works, demonstrating that the criticism of using religion as a veneer for immoral activities is a recurring narrative in literature.