apostasy
From Longman Dictionary of Contemporary EnglishRelated topics: Religionapostasya‧pos‧ta‧sy /əˈpɒstəsi $ əˈpɑː-/ noun [uncountable] formalRRRELIGION when someone suddenly stops believing in a religion or supporting a political partyExamples from the Corpusapostasy• They include theft, adultery and fornication, wine drinking, highway banditry, apostasy to of the faith and rebellion.• His apostasy had cost him his empire.• His apostasy was repulsive to the Xerox people.Origin apostasy (1300-1400) Late Latin apostasia, from Greek, from aphistasthai “to revolt”, from apo- ( → APOCALYPSE) + histasthai “to stand”