Prior to 1977, the question excluded Orthodox and simply asked: What is your religious preference -- is it Protestant, Roman Catholic or Jewish?It is possible that the wording of this question leads to an undercount of groups not specifically mentioned in the question.
Other studies: Glenmary and Kosmin NSRI:
In the 1990 Glenmary study, which published denominational statistics for every county and every state in the United States, the National Baptist Convention (U.S.A.), the National Baptist Convention of America, the Church of God in Christ, and the African Methodist Episcopal Church were not among the 133 denominations data was collected for individually.
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Muslim community leaders say that many American Muslims are relatively recent immigrants who either do not have telephone service, do not participate in surveys or are afraid to identify themselves as Muslims for fear of anti-Muslim discrimination.
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Consulate or Consulate-General, in the case of United Kingdom, is a lower level diplomatic representative office of a foreign country, often located in a city outside of London and is typically headed by the Consul-General.
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Note that in the NSRI and ARIS studies, based on self-identification, Christianity includes: Catholic, Baptist, Protestant, Methodist/Wesleyan, Lutheran, Presbyterian, Pentecostal/Charismatic, Episcopalian/Anglican, Mormon/Latter-day Saints/LDS, Churches of Christ, Jehovah's Witness, Seventh-Day Adventist, Assemblies of God, Holiness/Holy, Congregational/United Church of Christ, Church of the Nazarine, Church of God, Eastern Orthodox, Evangelical, Mennonite, Christian Science, Church of the Brethren, Born Again, Nondenominational Christians, Disciples of Christ, Reformed/Dutch Reformed, Apostolic/New Apostolic, Quaker, Full Gospel, Christian Reform, Foursquare Gospel, Fundamentalist, Salvation Army, Independent Christian Church, Covenant Church, Jewish Christians, plus 240,000 adults classified as "other" (who did not fall into the preceding groups).
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Islam. In recent years Muslim leaders in the United States have optimistically estimated that there were approximately 6.5 million Muslims in the country (Aly Abuzaakouk, American Muslim Council, 1999).
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The NSRI study indicated there were 28,000 self-identified Baha'is in the United States in 1990, making them the 11th largest religion in the country.
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Thus, they constitute a set of numbers which are highly uniform in methodology, and are not subject to internal institutional variations in the way that membership and activity is counted or estimated.