The essential feature of a heresy is that it is not unbelief {rejection of the core beliefs of a worldview such as Christianity} in the strict sense of the term, but a form of that faith that is held ultimately to be subversive or destructive, and thus indirectly leads to such unbelief. Unbelief is the outcome, but not the form, of heresy.
( Alister E. McGrath )
[ Heresy: A History of Defending ]
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