Between 2010 and 2020, which major religious group grew the fastest worldwide?
AnswerIslam (Muslims)
The global Muslim population grew by 347 million in that decade, more than any other religion.
Source: Pew Research Center (2020) pewresearch.org
Society · Facts & sources
Muslim facts & stats
6 sourced facts about Muslims worldwide and in the United States — population, growth and demographics, each with the context behind the number. 4 more are in today's round and appear here after it closes.
Going deeper
About how many Muslims were estimated to be living in the United States in 2017?
Answerabout 3.45 million
That estimate includes Muslims of all ages living across the country.
Source: Pew Research Center (2017) pewresearch.org
What share of US Muslim adults hold a four-year college degree?
Answer44%
That's a notably higher college-degree rate than the overall US Christian population.
Source: Pew Research Center (2025) pewresearch.org
About what share of US Muslim adults were born outside the United States?
Answerabout 59%
Immigration has played a major role in shaping the US Muslim community, alongside a younger, US-born generation.
Source: Pew Research Center (2025) pewresearch.org
Expert level
On average, how many children did Muslim women have during 2010-2020, compared with 2.2 for non-Muslim women?
Answer2.9 children
Higher fertility, plus a younger median age, are the main drivers of Muslim population growth.
Source: Pew Research Center (2020) pewresearch.org
By 2050, the US Muslim population is projected to reach about what share of the country?
Answerabout 2.1% (8.1 million people)
Pew projects Muslims will surpass Jews as the second-largest US religious group after Christians by 2040.
Source: Pew Research Center (2018) pewresearch.org
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