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The Future of World Religions: Population Growth Projections, 2010-2050 (Pew Forum)
"The religious profile of the world is rapidly changing, driven primarily by differences in fertility rates and the size of youth populations among the world's major religions, as well as by people switching faiths."
Global Christianity - A Report on the Size and Distribution of the World's Christian Population (Pew Forum)
"A comprehensive demographic study of more than 200 countries finds that there are 2.18 billion Christians of all ages around the world, representing nearly a third of the estimated 2010 global population of 6.9 billion."
Will religion ever disappear? (BBC)
"It's impossible to predict the future, but examining what we know about religion - including why it evolved in the first place, and why some people chose to believe in it and others abandon it - can hint at how our relationship with the divine might play out in decades or centuries to come."