Source: Hartford Institute for Religion Research February 2002 The quick answer:  Far less than usually reported. The longer answer:  According to a recent study of Orthodoxy in the United States, the real membership (number of adult adherents and their children) in all Eastern Christian Churches in the USA can be estimated atabout 1,200,000 persons.  This figure is considerably less than the commonly accepted estimations, which range as high as over four million. The greatest disproportions between “claimed” and actual memberships were found in the two largest Orthodox jurisdictions: Greek Orthodox Archdiocese (typically claimed 1,954,500* members versus 440,000 actual adherents) Orthodox Church in…