Islam was the world’s fastest-growing religion from 2010 to 2020
From 2010 to 2020, the number of Muslims increased by 347 million people to 2.0 billion people.
Numbers, Facts and Trends Shaping Your World
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Search results for: “christianism”
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Around the World, Many People Are Leaving Their Childhood Religions
In many places surveyed, 20% or more of all adults have left their childhood religious group. Christianity and Buddhism have had especially large losses.
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15. Why we revised our estimates for 2010
Read how Pew Research Center revised our estimates to reflect methodological advances, incorporate newly available data, and allow comparison across measures in this report.
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22. Religion’s role in public life
Read more about Americans’ views about religious organizations and their effects on society, as well as the separation of church and state. Religious Landscape Study by Pew Research Center.
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1. Religious identity
Christians’ share among U.S. adults has fallen across demographic groups since 2007, but there has been overall stability in religious makeup since 2020. Religious Landscape Study by Pew Research Center.
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9. Religion in Asia and the Pacific
Hindus, Muslims and the unaffiliated each make up about a quarter or more of the Asia-Pacific population. These groups all grew there from 2010-2020.
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2. Beliefs about the afterlife
In nearly every place surveyed, half or more say life after death is likely. Fewer believe in reincarnation or that ancestral spirits can affect their lives.
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24. Age, race, education and other demographic traits of U.S. religious groups
Read about U.S. religious groups’ demographics – such as race/ethnicity, age, immigrant status, gender and sexual orientation – and their trends since 2007. Religious Landscape Study by Pew Research Center.
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short reads
Striking findings from 2025
Here’s a look back at 2025 through 12 of our most striking research findings.
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1. God, spirits and the natural world
Large majorities around the world say they believe in God. Read about beliefs in spiritual presence “beyond the natural world,” and in animals and nature.