The government says there are 21m (16m Protestants, 5m Catholics). Unofficial figures, such as one given by the Centre for the Study of Global Christianity in Massachusetts, put the number at about 70m. But Mr Zhao is not alone in his reckoning.
A study of China by the Pew Forum on Religion and Public Life, an American think-tank, says indirect survey evidence suggests many unaffiliated Christians are not in the official figures.
And according to China Aid Association (CAA), a Texas-based lobby group, the director of the government body which supervises all religions in China said privately that the figure was indeed as much as 130m in early 2008.
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