In 1975, Leo Rosten published his Religions of America, an exhaustive compilation of statistical information on every major and
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minor group of believers in the country. In retrospect, it may seem surprising that the book contained no discussion of Islam. But this was not an oversight; for at the time Muslims in America were a statistically insignificant minority, numbering fewer than one thousand individuals.
By contrast, Islam is today the second-largest and fastest growing religion in America, with more than six million adherents.
