unfaithful
Sabbath-breaker
apostatize
atheist
atheistic
backslider
backsliding
blasphemer
blasphemous
bolter
collaborationist
collaborative
collaborator
convert
deconvert
defector
degenerate
demurrer
deserter
disloyal
dissenter
dissentient
dissident
faithless
fallen
fallen from grace
fifth columnist
impious
irreligious
irreverent
lapsed
mugwump
nonconformist
objector
opinionist
opposition voice
pervert
profanatory
profane
proselyte
protestant
protester
quisling
rat
recidivist
recidivistic
recreant
recusant
renegade
quitter
apostasy
Franciscan
adulterer
blasphemers
deist
evildoer
heretic
infidel
poltroon
popish
prelacy
schismatic
unbeliever
unfrocked
white-robed