What happens when religion is banned? No, I am not thinking of Christianity under the Roman Empire before Constantine, but of the People’s Republic of China in the years between 1966 and 1979. The result was a great deal of cruelty and suffering at the time, but it also led to secret and unauthorised religious gatherings all over the country since 1980, and endless attempt to bring religion back under control. At present we may observe further tough measures to keep religion on safe tracks. But judging by previous efforts, success will be limited.