Heresy is any belief or theory that is strongly at variance with established beliefs or customs, particularly the accepted beliefs or religious law of a religious organization. A heretic is a proponent of heresy.
Heresy in Judaism, Christianity, and Islam has at times been met with censure ranging from excommunication to the death penalty.
Heresy is distinct from apostasy, which is the explicit renunciation of one's religion, principles or cause; and from blasphemy, which is an impious utterance or action concerning God or sacred things. Heresiology is the study of heresy.
Main article image
Galileo facing the Roman Inquisition.jpg
Jensky kodex Zizka.jpg
Jan Žizka leads a field army, a depiction from the Jena Codex from the end of the C.E.15th century.
Maker unknown, Sino-Tibetan - Acarya Bhavaviveka Converts a Nonbeliever to Buddhism - Google Art Project.jpg
(copied from source, caption author unknown): Acharya Bhavaviveka, the founder of an influential sc...
Massacre of the Vaudois of Merindol.jpg
Massacre_of_the_Vaudois_of_Merindol
Portrait of Martin Luther as an Augustinian Monk.jpg
Saint Nicholas of Myra slapping Arius at the Council of Nicaea Greek Icon.jpg
Detail of a late medieval Greek Orthodox icon showing Saint Nicholas of Myra slapping Arius at the F...
Supplice des Amauriciens.jpg
Illustration from the illuminated manuscript Grandes Chroniques de France depicting the burning of A...