The Church of Scientology

The Church of Scientology has said that it had as many as 10 million members as of 2006,[55] though actual membership figures it has released indicate a far smaller total. Third party estimates of Scientology's worldwide membership range from less than 100,000[56] to approximately 500,000.[57] According to a 2001 survey published by the City University of New York, 55,000 people in the United States would, if asked to identify their religion, have said Scientology.[58]

Source: http://en.wikipedia.org/wiki/Scientology