Synonyms of 'heresy'
The heresy of one age becomes the orthodoxy of the next– Optimism]
They that approve a private opinion, call it opinion; but they that mislike it, heresy; and yet heresy signifies no more than private opinion– Leviathan]
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If someone is accused of apostasy, they are accused of abandoning their religious faith, political loyalties, or principles.
a charge of apostasy
Thesaurus for heresy from the Collins English Thesaurus
Heresy is a belief or action that most people think is wrong , because it disagrees with beliefs that are generally accepted .