Christianity in China has a history going back to the 7th century during the Tang dynasty. Today, it comprises Catholics, Protestants, and a small number of Orthodox Christians. Although its lineage in China is not as ancient as Taoism, Mahayana Buddhism or Confucianism, Christianity has been one of the religions of China since at least the seventh century and has gained influence over the past 200 years. The number of Chinese Christians has increased significantly since the easing of restrictions on religious activity during economic reforms in the late 1970s; Christians were four million before 1949 (three million Catholics and one million Protestants).
Accurate data on Chinese Christians is hard to access. According to the most recent internal surveys there are approximately 31 million Christians in China today (2.3% of the total population). On the other hand, some international Christian organizations estimate there are tens of millions more. The practice of religion continues to be tightly controlled by government authorities. Chinese over the age of 18 are only permitted to join officially sanctioned Christian groups registered with the government-approved Protestant Three-Self Church and China Christian Council, and Chinese Patriotic Catholic Church. On the other hand, many Christians practice in informal networks and unregistered congregations, often described as house churches or underground churches, the proliferation of which began in the 1950s when many Chinese Protestants and Catholics began to reject state-controlled structures purported to represent them. Members of such groups are said to represent the "silent majority" of Chinese Christians and represent many diverse theological traditions.