Making predictions based solely on population changes is a dangerous game, since other factors can intervene, but it's one of the few games we have. Based on birth rates in various communities and shifting world demographics …
… By 2050, Muslims are expected to be close to the same proportion of the world population — around 30% — as Christians will be. Both religions will be growing in numbers, largely in sub-Saharan Africa.
… In the US, Muslims will supplant Jews as the largest non-Christian sect, growing to about 10%, with Christianity dropping from about 3/4 to 2/3 of the population, and "Unaffiliateds" growing as a percentage.
… "Unaffiliateds" as a world population, will decrease in proportion, due to higher birth rates among most religious groups.
Whether this is good news, bad news, or just news to bear in mind is left as an exercise for the reader.
The Future of World Religions: Population Growth Projections, 2010-2050
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.
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