Apostasy

[Sarah]

An abandonment of what one has voluntarily professed; a totaldesertion of departure from one's faith, principles, or party; esp.,the renunciation of a religious faith; as, Julian's apostasy fromChristianity.

[Sarah]

The action of abandoning a party or getting cured from the effect of a religion virus, or a similar kind of brainwashing.
See also [apostate]

[Julene]

the act of giving up your religious or political beliefs and leaving a religion or a political party:

[Agnes]

The abandonment or renunciation of a religious or political belief.