atheistic
atheistical
ethnic
heathen
heathenish
lapsed
nonchurchgoing
nonobservant
pagan
unbelieving
amoral
apostate
backsliding
blasphemous
creedless
disbelieving
faithless
fallen
fallen from grace
godless
heretical
impious
incredulous
indevout
irreverent
minimifidian
nonbelieving
nonreligious
nullifidian
profanatory
profane
recidivist
recidivistic
recreant
renegade
repudiative
ribald
sacrilegious
sinful
un-Christly
unangelic
unchristian
unconfident
unconverted
unconvinced
undevout
undutiful
ungodly
unholy
irreligiously
religious
anti-religious
antisocial
deprave
dishonest
hypocritical
immoral
inappropriate
indelicate
irrational
lascivious
licentious
profligate
seditious
superstitious
ungenerous
devout