Jehovah’s Witnesses consider themselves to be the only true Christians. However, their organization – the Watchtower Bible & Tract Society – denies and/or contradicts several of the essential doctrines of the Christian faith.
Individuals who, while claiming to be Christians, reject one of more central (key) doctrines of the Christian faith are considered heretics. Groups which reject such doctrines while claiming to represent Christianity, are considered cults of Christianity.
Thus, while Jehovah’s Witnesses profess to be Christians, they are outside orthodox Christianity and are considered to be, theologically, a cult of Christianity.
Sociologically, this religious movement has a number of cult-like characteristics and problems as well, including the high level of control exerted over its members’ lives, its unbiblical approach to the practice of shunning, and its teachings regarding blood transfusions (which have resulted in many needless deaths).