"Short answer: The 2001 edition of Barrett's World Christian Encyclopedia, identifies 10,000 distinct religions, of which 150 have 1 million or more followers. Within Christianity (counted as just one religion), 33,830 different denominations are counted. This would include denominations as large as Catholicism and as small as Shakers.
It could be pointed out that most of these religions are confined to a fairly restricted geographical region and often to single ethnic groups. The Major Religions of the World web page lists only 22 "major world religions." This is far fewer than the 150 religions Barrett lists which have 1 million or more adherents. This is because the list of "major world religions" only includes religions with a significant presence beyond a single country.
For the number of religions in the United States, the best source to consult is the excellent Encyclopedia of American Religions by J. Gordon Melton." [More...]
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