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84% of the world identifies as religious. People with no religious affiliation make up 3rd-largest global group (incl. people with spiritual belief but no "established" faith). – The Global Religious landscape by the Pew Forum on Religion and Public Life, 2012
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…in reply to @axbom
More on The Global Religious landscape: pewforum.org/2012/12/18/global-religious-landscape-exec/