apostasy /ə-posˈtə-si/

1. Abandonment of one's religion, principles or party
2. A revolt from ecclesiastical obedience, from a religious profession, or from holy orders (RC)
3. Defection

apostˈate /-āt or -it/ noun

1. A person who has abandoned their religion, principles, etc
2. A renegade, deserter from any allegiance

Having abandoned one's religion, etc

apostatic /ap-ō-statˈik/ or apostatˈical adjective

apostatize or apostatise /ə-posˈtə-tīz/ intransitive verb

• creed
• Creed
• creedal
• creeds
• creeing
• diploes
• diplogen
• diplogeneses
• diplogenesis
• diplogens
• diploid
• diploidies
• diploidy
• diploma
• diplomacies
• diplomacy
• diplomaed
• diplomaing
• diplomas
• diplomat
• diplomate
• diplomated
• diplomates
• diplomatese
• diplomateses