Never mind whether you regularly visit a place of worship: do you consider yourself a religious person? Yes, said 62% of 60,000 people across 68 countries polled by WIN/Gallup for a survey published in 2017. Back in 2005, the score for that answer was 77%.

Minus 15 percentage points in just 12 years—that’s a fairly steep decline. Does that mean that atheism is gaining ground worldwide? Yes, but not by as much as these figures seem to suggest, for three reasons.

Firstly, because there’s a large and growing middle between those who positively believe in God and those who positively don’t. In 2005, just 5% of those surveyed in 2005 considered themselves ‘convinced atheists’—the remaining 18% were non-religious or ‘don’t knows’. In 2017, the fish-nor-fowl brigade had grown to 30%. ‘Convinced atheists’ had increased as well, but only to 9%.

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