It’s just after 6am and the sun is not yet up. Two hundred children stand in a clearing, surrounded by a dense jungle of palm trees on an island off the Florida coast. A girl of about 15 climbs a stepladder in the middle of the group and everyone bows their heads. ‘We pray the Lord will keep us safe today,’ she says. The children divide into smaller groups and disappear into the forest where, one at a time, they embark on an army-style obstacle course that involves crawling through painted steel tunnels, scrambling over a 20ft mountain of tyres, climbing over huge wooden walls emblazoned with the words ‘doubt’, ‘anxiety’ and ‘confusion’, and then attempting to put large wooden boxes, painted with the books of the Bible, in chronological order.

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