Heresy in Christianity

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Heresy in Christianity denotes the formal denial or doubt of a core doctrine of the Christian faith^[1] as defined by one or more of the Christian churches.^[2]

The study of heresy requires an understanding of the development of orthodoxy and the role of creeds in the definition of orthodox beliefs, since heresy is always defined in relation to orthodoxy. Orthodoxy has been in the process of self-definition for centuries, defining itself in terms of its faith by clarifying beliefs in opposition to people or doctrines that are perceived as incorrect.