Demographics
The U.S. Census Bureau does not collect data on religious identification. Various institutions and organizations have given widely varying estimates about how many Muslims live in the U.S. Tom W. Smith, author of "Estimating the Muslim Population in the United States," said that of twenty estimates he reviewed during a five-year period until 2001, none was "based on a scientifically-sound or explicit methodology. All can probably be characterized as guesses or assertions. Nine came from Muslim organizations such as the Islamic Society of North America, the Muslim Student Association, the Council on American-Islamic Relations, the American Muslim Council, and the Harvard Islamic Society or unspecified "Muslim sources." None of these sources gave any basis for their figures."
Others claim that no scientific count of Muslims in the U.S. has been done, but that the larger figures should be considered accurate. Some journalists have also alleged that the higher numbers have been inflated for political purposes.
Read more about this topic: Islam In The United States