The World's Religious Groups: How Their Sizes Changed from 2010 to 2020
evidence
Between 2010 and 2020 Christians fell 1.8 percentage points to 28.8% of world population (about 2.3 billion, an absolute rise of 122 million) while Muslims rose 1.8 points to 25.6% (an absolute rise of 347 million); Christians remained the largest group and Muslims the fastest-growing.
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