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

• creepers
• creep-hole
• creep-holes
• creepie
• creepier
• creepies
• creepiest
• creepily
• creepiness
• creeping
• creeping bent grass
• creeping eruption
• creeping Jenny
• creeping Jesus
• creepingly
• creeping thistle
• creeping thistles
• creepmouse
• creeps
• creepy
• creepy-crawlies
• creepy-crawly
• crees
• Crees
• creese