For centuries, access to the people of China was difficult for the Catholic Church, because as a Church she did not recognize local Confucian customs of honouring deceased family members. To the Chinese, this was an ancient ritual; to the Holy See, it was a religious exercise which conflicted with Catholicdogma. As a result of this and its foreign origin, the Church encountered much resistance in China. Within month of his election, Pope Pius XII issued a dramatic change in policies. On December 8, 1939, the Sacred Congregation of the Propagation of Faith issued at his request a new instruction by which Chinese customs were considered not superstitious, but an honourable way of showing esteem for one's relatives and therefore permitted by Catholic Christians. Within a short interval, in 1943, the Government of the Republic of China established diplomatic relations with the Holy See. The Papal decree changed the ecclesiastical situation in China in an almost revolutionary way. As the Church began to flourish, Pius elevated China's status within the Church, established a local ecclesiastical hierarchy, and received the Archbishop of Peking, Thomas Tien Ken-sin SVD, into the College of Cardinals. After the Second World War, an estimated four million Chinese professed the Catholic faith. By 1948, the Catholic Church operated some 254 orphanages and 196 hospitals with 81,628 beds, carrying out a great deal of pastoral work throughout China. While Catholics represented less than one percent of the population, they had increased dramatically. In 1949, there were in mainland China:
The establishment of Mao Zedong's communist regime in 1949 put these early advances on hold and led to the persecution of thousands of clergy and faithful in China. The losses in the following years were considerable. Some of the Catholic hierarchy, including the archbishops of Nanking and Peking, left the mainland and eventually made their way to Taiwan. In 1951, the Papal Nuncio, Archbishop Riberi, was expelled, as were many foreign missionaries, who were accused of acting as agents of imperialist forces. Hundreds more Catholic clergy experienced increased supervision, frequent arrests and torture, and Catholic laypeople were under tremendous pressure to renounce their faith. The Holy See reacted with several encyclicals and apostolic letters, Cupimus Imprimis, Ad Apostolorum principis, and Ad Sinarum gentem. In 1957, a schismatic Chinese Catholic Patriotic Association, which does not recognize papal authority, was formed by the Chinese Communist Party. Bishops and priests who refused to join the Patriotic Association were imprisoned, forced to engage in degrading and exhaustive manual labor, and many were martyred in captivity.
Tien was the first Cardinal also from the Society of the Divine Word.
The Holy See has not recognized any of CPCA-approved successors of Tien as Archbishop of Peking, though in his 2007 letter to the faithful in China, Pope Benedict XVI expressed an openness to dialogue with the CPCA-appointed "bishops".