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More than 30% of the world’s population — 2.2 billion people — are Christian, according to a major religious survey. The 32% of the world that was Christian in 2010 was down from 35% a century ago, says the survey by the Pew Forum on Religion and Public Life that analyzed more than 2,500 censuses, surveys and population registers. About half of all Christians are Roman Catholic (50%) and an estimated 37% of Christians belong to the Protestant tradition, broadly defined as Anglicans, independents and non-denominational churches.



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