Throughout the history of organized religion there have been congregants who became dissatisfied with the structure of orthodoxy. These people left to develop their own forms of worship. The new groups were considered heretical by the mainstream religions, and were branded as "cults." In other instances, those who practiced ancient forms of deity worship that were before the more recently established religions were identified as "devil-worshippers." In this chapter, a number of faith groups that have been called cults and heresies are examined.