tartufe
Holy Willie
Joseph Surface
Mawworm
Pecksniff
Pharisee
affecter
canter
canting hypocrite
dissembler
dissimulator
fair-weather friend
false friend
formalist
hypocrite
lip server
lip worshiper
mealymouth
pharisee
phony
pietist
pious fraud
poser
ranter
religionist
religious hypocrite
sanctimonious fraud
sniveler
snuffler
spiritual humbug
summer soldier
whited sepulcher
phoney
pretender