agnostic
agnostical
incredulous
irreligious
atheist
atheistic
creedless
disbelieving
distrustful
distrusting
doubting
faithless
gentile
goyish
heathen
heretical
infidel
infidelic
minimifidian
misbelieving
mistrustful
mistrusting
non-Christian
non-Jewish
non-Mohammedan
non-Mormon
non-Moslem
non-Muhammadan
non-Muslim
nonbelieving
nullifidian
pagan
questioning
quizzical
repudiative
sceptical
skeptical
suspicious
unchristian
uncircumcised
unconfident
unconverted
unconvinced
unpersuaded
without faith
anguished
appreciative
contemptuous
disdainful
dismissive
dumbfounded
idolatrous
mutinous
open-mouthed
rapt
reproachful
resentful
speechless
supercilious
uncomprehending
unsympathetic
wide-eyed
wry
achieving
believing
conceiving
deceiving
grieving
heaving
interleaving
interweaving
leaving
misconceiving
perceiving
receiving
relieving
retrieving
self-deceiving
thieving
weaving