Protestant Christianity (, in comparison to earlier Roman Catholicism) entered China in the early 19th century, taking root in a significant way during the Qing dynasty. Some historians consider the Taiping Rebellion to have been influenced by Protestant teachings. Since the mid-20th century, there has been an increase in the number of Christian practitioners in China. According to a survey published in 2010 there are approximately 40 million Protestants in China. As of 2019, Fenggang Yang, a sociologist of religion at Purdue University, estimated that there are around 100 million Protestant Christians in China. Other estimates place the number of Protestant Christians at around 40-60 million Much of this growth has occurred in informal networks referred to as house churches, the proliferation of which began in the 1950s when many Chinese Catholics and Protestants began to reject state-controlled structures purported to represent them. Members of such groups are now said to represent the "silent majority" of Chinese Christians and represent many diverse theological traditions. Early history Protestant Christianity did not arrive in China until Robert Morrison of the London Missionary Society began work in 1807 at Macau. Under the "fundamental laws" of China, one section is titled "Wizards, Witches, and all Superstitions, prohibited." The Jiaqing Emperor in 1814 A.D. added a sixth clause in this section with reference to Christianity. It was modified in 1821 and printed in 1826 by the Daoguang Emperor. It sentenced Europeans to death for spreading Christianity among Han Chinese and Manchus. Christians who would not repent their conversion were sent to Muslim cities in Xinjiang, to be given as slaves to Muslim leaders and beys. The clause stated: "People of the Western Ocean, [Europeans or Portuguese,] should they propagate in the country the religion of heaven's Lord, [name given to Christianity by the Catholics,] or clandestinely print books, or collect congregations to be preached to, and thereby deceive many people, or should any Tartars [Manchus] or Chinese, in their turn, propagate the doctrines and clandestinely give names, (as in baptism,) inflaming and misleading many, if proved by authentic testimony, the head or leader shall be sentenced to immediate death by strangulations : he who propagates the religion, inflaming and deceiving the people, if the number be not large, and no names be given, shall be sentenced to strangulation after a period of imprisonment. Those who are merely hearers or followers of the doctrine, if they