church synods like other Catholic leaders. Also, many underground clergy and laymen are active in the official Patriotic Church as well. Still, there are periods of discomfort between Vatican and the Patriotic Church: Pope Benedict XVI condemned the Patriotic Catholic leaders as "persons who are not ordained, and sometimes not even baptised", who "control and make decisions concerning important ecclesial questions, including the appointment of bishops". The Chinese state indeed continues to appoint bishops and intervene in the church's policy (most notably on abortion and artificial contraception) without consulting the Vatican and punishing outspoken dissenters. In one notable case that drew international attention, Thaddeus Ma Daqin, the auxiliary bishop of Shanghai whom both the Vatican and Chinese state agreed as the successor to the elderly Aloysius Jin Luxian, the Patriotic Catholic bishop of Shanghai (whom the Vatican also recognized as the coadjutor bishop), was arrested and imprisoned after publicly resigning from his positions in the Patriotic Church in 2012, an act which was considered a challenge to the state control over the Catholic Church in China. A Christian spiritual revival has grown in the first decades of the twenty-first century. The Communist Party remains officially atheist, and has remained intolerant of churches outside party control. Christianity has grown rapidly, reaching 67 million people. In recent years, however, the Communist Party has looked with distrust on organizations with international ties; it tends to associate Christianity with what it deems to be subversive Western values, and has closed churches and schools. In 2015, outspoken pastors in Hong Kong and their associates on the mainland came under close scrutiny from government officials. Contemporary People's Republic of China Subdivision of the Christian community Official organizations—the Chinese Patriotic Catholic Church and the Chinese Protestant Church The Catholic Patriotic Church and the Protestant Three-Self Patriotic Movement are centralised and government-sanctioned Christian institutions which regulate all local Christian gatherings, all of which are required to be registered under their auspices. Unregistered churches Many Christians hold meetings outside of the jurisdiction of the government-approved organizations and avoid registration with the government and are often illegal. While there has been continuous persecution of Chinese Christians throughout the twentieth century, particularly during the Cultural Revolution, there has been increasing tolerance of unregistered churches since the late 1970s. Catholic groups are usually known as underground churches and Protestant groups are usually known as house churches. The Catholic underground churches are those