Demographer Conrad Hackett explains how he and his team put together our major new report and why it differs from past efforts to predict religious change.
Their population dropped devastatingly fast after their first contact with Western foreigners in 1778, but their numbers are returning to "pre-contact" levels.
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. This table details the estimated religious composition of 198 countries and territories for 2010 to 2050.
What will the world’s religious landscape look like a few decades from now?
As of 2010, nearly a third of the world's population identified as Christian. But if demographic trends persist, Islam will close the gap by the middle of the 21st century.
Meanwhile, foreign-born shares among whites and blacks are expected to rise, according to new Census Bureau projections.