Before the Nanjing Religious Case (16 16), there were also some incidents in which some priests were besieged by local people, insulted, their houses were disturbed, arrested and imprisoned, and deported. However, these incidents are only local events, which have little influence and will soon subside. However, the difficulty of teaching in Nanjing is different. This happened in the sixth year after Matteo Ricci's death and lasted intermittently for several years. The consequences were quite serious.
16 19 July 15, Tang Ruowang and his parishioners arrived in Macau and were placed in St. Paul's College. As soon as the missionaries set foot on the land of China, they began to study the language and culture of China carefully, even aiming at mastering Beijing Mandarin. When in Rome, these western monks do as the Romans do, take off their robes, put on Confucian clothes, live in Chinese-style houses, and devote themselves to studying China's classics, history and ethics, looking for the integration of eastern and western cultures. In the process of communicating with celebrities in the ruling and opposition circles, these western missionaries, who are proficient in astronomy, geography and Chinese classics, naturally won the favor and trust of China literati, thus achieving the purpose of spreading their beliefs. This is the missionary strategy of "combining Confucianism with Confucianism" initiated by Matteo Ricci. However, some fanatical missionaries thought that Matteo Ricci was too accommodating to the people of China, which affected the "purity" of Catholicism and made the development of Christians too slow. After Matteo Ricci's death, he began to change his missionary route, adopted radical missionary methods, resolutely rejected Confucianism, and prohibited China parishioners from offering sacrifices to heaven, ancestors and Confucius, which aroused the resentment and suspicion of the public and led to the "Nanjing Religious Case", and the missionaries were expelled, with little place in the mainland of China.