CNN Fareed Zakaria GPS May 31, 2015 17:31:00
Christians and muslims will increase in numbers overall, keeping up with population growth or better, while the non-religious will see their share of the population decline. thats because religion will thrive in developing parts of the world, like subsaharan africa, where birthrates are high. pew predicts the demographics will also contribute to a significant shift in the relative popularity of certain religions. in 2010 christianity was the most popular faith, with islam ranking second. in 2050...
Pew Research Center Population Growth Population Decline Birth Rates Sub Saharan Africa Islam Ranking Second
Source: archive.org