| http://www.w3.org/ns/prov#value | - Washington - Christians are the world's biggest religious group, numbering about 2.2 billion people, according to a study released on Tuesday by the Pew Forum on Religion and Public Life.Pew assembled data on the size and geographic distribution of eight major religious groups, including non-believers.It found that Christians make up about 32% of the world's population, followed by Muslims, the se
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