RELIGIOUS ADHERENTS IN THE UNITED STATES AND THE WORLD

Largest Number of Religious Adherents in the United States : Mid-2000-2010

(Derived from the 2007 Megacensus of Religions, by David B. Barrett, Todd M. Johnson, Peter F. Crossing, in Time Almanac, 2008 and The Global Religious Landscape A Report on the Size and Distribution of the World’s Major Religious Groups as of 2010)

Religion 2000 
Number
% of Total U.S. Pop., 
2000
2010 % Total U. S. Population 2010
Christianity 159,030,000 76.5% 243,060,00 78%
Unaffiliated 46,960,700 16.5% 50,980,000 16.4%
Judaism 2,831,000 1.3% 5,699,000 1.8%
Islam 1,104,000 0.5% 2,770,000 .9%
Buddhism 1,082,000 0.5% 3,577,000 1.2%
Hinduism 766,000 0.4% 1,790,000 .6%

MAJOR WORLD RELIGIONS RANKED BY NUMBER OF ADHERENTS

(The Global Religious Landscape A Report on the Size and Distribution of the World’s Major Religious Groups as of 2010)

Religion Est. No. Adherents Percent of World Pop.
Christianity 2.2 billion 32.5 percent
Islam 1.6 billion 23.2 percent
Secular/Nonreligious/Agnostic/Atheist 929 million 16.3 percent
Hinduism 1.0 billion 15 percent
Buddhism 500 million 7.1 percent
Folk Religions 400 million 6 percent
Other Religions* 58 million 1 percent
Judaism 14 million .20 percent

* Religions such as Baha’I, Jainism, Sikism,Taoism, Wicca, Zoroastorism.

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