As he stood in the hot sun and watched a dozen earth movers smash through the walls of the Sanjiang church, Mr Dai felt a great sadness and also fear – for himself and for the future of his fellow Christians. “There were so many police blocking the road and surrounding mountains. They had cut off power to the whole area and blacked out mobile phone coverage and they were trying to stop anybody coming near,” he says.

By pretending to be part of the demolition crew, Dai managed to get through the outer cordon of riot police and huddle with a small group of believers on a hillside watching the massive building collapse under the onslaught. “Words can’t express how traumatic it was,” says the devout Christian, who had travelled from another parish to join members of the congregation trying to protect the church. “I just kept thinking of Jesus’s words – ‘They know not what they do’ – they don’t realise it but they will surely be judged by God.”

The demolition of this towering Protestant cathedral on the outskirts of the coastal Chinese city of Wenzhou on April 28 2014 marked the spectacular launch of a government campaign to curtail the fastest-growing religion in nominally atheist China. There are now about 100 million Christians in the world’s most populous nation, eclipsing the 86.7 million-strong membership of the ruling Communist party. According to western intellectual tradition, modernity is supposed to bring secularisation but in modern Communist China it has been accompanied by an extraordinary rise of religions formerly banned as “opiates of the masses”.