Why did Pope Clement XI forbid Chinese Catholics from taking part in ancestor worship?

Pope Clement XI forbade Chinese Catholics from participating in ancestor worship because the Roman Catholic Church concluded that these rituals, along with the veneration of Confucius, were inseparable elements of traditional Chinese religion. Consequently, the Church deemed these practices to be tainted with superstition and fundamentally incompatible with Christian worship and doctrine.12

This decision served as the climax of the Chinese Rites Controversy, a long-standing dispute between different missionary orders. While Jesuits had historically argued that such ceremonies were social rituals that could be adapted to Christian purposes, other orders—such as the Dominicans and Franciscans—viewed them as pagan and incompatible with the faith. Clement XI formalized this rejection in a 1704 decree, which was later reinforced by his 1715 bull, Ex Illa Die.2314