Etymology
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apostasy (n.)

late 14c., "renunciation, abandonment or neglect of established religion," from Late Latin apostasia, from later Greek apostasia for earlier apostasis "revolt, defection," literally "a standing off," from apostanai "to stand away" (see apostate (n.)). General (non-religious) sense "abandonment of what one has professed" is attested from 1570s.

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Definitions of apostasy

apostasy (n.)
the state of having rejected your religious beliefs or your political party or a cause (often in favor of opposing beliefs or causes);
Synonyms: renunciation / defection
apostasy (n.)
the act of abandoning a party for cause;
Synonyms: tergiversation
From wordnet.princeton.edu