CHRISTIANITY is growing almost as fast as humanity itself, but its 2.2 billion adherents cannot count on safety in numbers. That is partly because the locus of the world’s largest religion is shifting to hotter (in several senses) parts of the world. According to a report published by the Pew Forum in December, the Christian share of the population of sub-Saharan Africa has soared over the past century, from 9% to 63%. Meanwhile, the think-tank says, the Christian proportion of Europeans and people in the Americas has dropped, respectively, from 95% to 76% and from 96% to 86%.

But moving from the jaded north to the dynamic south does not portend an easy future. In Nigeria scores of Christians have died in Islamist bomb attacks, targeting Christmas prayers. In Iran and Pakistan Christians are on death row, for “apostasy”—quitting Islam—or blasphemy. Dozens of churches in Indonesia have been attacked or shut. Two-thirds of Iraq’s pre-war Christian population have fled. In Egypt and Syria, where secular despots gave Christianity a shield of sorts, political upheaval and Muslim zeal threaten ancient Christian groups. Not all Christianity’s woes are down to Muslims. The faith faces harassment in formally communist China and Vietnam. In India Hindu nationalists want to penalise Christians who make converts. In the Holy Land local churches are caught between Israeli encroachment on their property and Islamist bids to monopolise Palestinian life. Followers of Jesus may yet become a rarity in his homeland.

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