
A new report from the Pew Research Center shows that Islam experienced the largest growth of any religious group between 2010 and 2020, with an increase of 347 million people. Researchers attribute this primarily to birth rates rather than religious conversion. The study found that Muslims remain concentrated in high-growth regions such as sub-Saharan Africa and the Middle East-North Africa, while the largest increase occurred in the Asia-Pacific region.
Christianity added 122 million people over the same period but declined as a share of the global population. Pew reports that many people who were raised Christian no longer identify with any religion, especially in Europe, North America, and Oceania. The religiously unaffiliated now make up 24.2% of the global population and represent the third largest group after Christians and Muslims.
Other findings include a 19 million decline in the global Buddhist population, largely due to disaffiliation in East Asia. Hindu populations grew through migration, particularly in the Middle East-North Africa and North America. The world’s Jewish population increased by about one million to 15 million people, with nearly half residing in Israel. Pew researchers used over 2,700 data sources across 201 countries to produce the study.
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