“It is hard even to guess at the number of Christians in China. Official surveys seek to play down the figures, ignoring the large number who worship in house churches. By contrast, overseas Christian groups often inflate them. There were perhaps 3m Catholics and 1m Protestants when the party came to power in 1949. Officials now say there are between 23m and 40m, all told. In 2010 the Pew Research Centre, an American polling organisation, estimated there were 58m Protestants and 9m Catholics. Many experts, foreign and Chinese, now accept that there are probably more Christians than there are members of the 87m-strong Communist Party. Most are evangelical Protestants.
Predicting Christianity’s growth is even harder. Yang Fenggang of Purdue University, in Indiana, says the Christian church in China has grown by an average of 10% a year since 1980. He reckons that on current trends there will be 250m Christians by around 2030, making China’s Christian population the largest in the world. Mr Yang says this speed of growth is similar to that seen in fourth-century Rome just before the conversion of Constantine, which paved the way for Christianity to become the religion of his empire.”