The U.S. government estimates the total population at 2.5 million (midyear 2021).  Citizens make up approximately 12 percent of the population, while noncitizens account for approximately 88 percent.  Most citizens are Sunni Muslims, and almost all others are Shia Muslims.  Reliable figures are unavailable, but estimates based solely on the religious composition of expatriates suggest Muslims, while they are the largest religious group, likely make up less than half of the total population.  The breakdown of the noncitizen population between Sunni, Shia, and other Muslim groups is not available.

Other religious groups, which are composed exclusively of expatriates, include (in descending order of size) Hindus, almost exclusively from India and Nepal; Roman Catholics, primarily from the Philippines, Europe, and India; and Buddhists, largely from South, Southeast, and East Asia.  Smaller groups include Anglicans and Protestant denominations, Egyptian Copts, Baha’is, and Greek and other Eastern Orthodox.

The U.S. government estimates the total population at 9.9 million (midyear 2021).  Approximately 11 percent are citizens, of whom more than 85 percent are Sunni Muslims, according to media reports.  The vast majority of the remainder are Shia Muslims, who are concentrated in the Emirates of Dubai and Sharjah.

Of the estimated 89 percent of noncitizen residents, the majority comes from South and Southeast Asia.  Although no official statistics are available on the percentage of the noncitizen population who are Muslim or the breakdown between Sunni and Shia Muslims, media estimates suggest less than 20 percent of the noncitizen Muslim population is Shia.

Of the total population (both citizen and noncitizen), the 2005 census, the most recent, found 76 percent of the population to be Muslim, 9 percent Christian, and 15 percent from other noncitizen religious groups, comprising mainly Hindus and Buddhists and including Parsis, Baha’is, Druze, Sikhs, and Jews.  Ahmadi Muslims, Ismaili Muslims, and Dawoodi Bohra Muslims together constitute less than 5 percent of the total population and are almost entirely noncitizens.  The Pew Research Center estimated that in 2010, 76.9 percent of the total population was Muslim, 12.6 percent Christian, 6.6 percent Hindu, and 2 percent Buddhist, with the remainder belonging to other faith traditions.  According to Boston University’s 2020 World Religions Database, the population includes approximately 125,000 atheists or agnostics, 72,000 Sikhs, and 49,000 Baha’is.