renegation
/ˌrɛnɪˈɡeɪʃn/noun
A desertion, betrayal, or abandonment of a set of principles, one's faith, etc.
Origin
Late 16th century; earliest use found in Robert Parsons (1546–1610), Jesuit. From post-classical Latin renegat-, past participial stem of renegare + -ion; compare -ation.