Lying, perhaps, in wrong church with religious class (9)
I believe the answer is:
insincere
'lying perhaps' is the definition.
'in wrong church with religious class' is the wordplay.
'wrong' becomes 'sin' (I've seen this before).
'church' becomes 'ce' (abbreviation for Church of England).
'with' says to put letters next to each other.
'religious class' becomes 're' (short for Religious Education).
'in'+'sin'+'ce'+'re'='INSINCERE'
(Other definitions for insincere that I've seen before include "Hollow" , "is not ringing true" , "Dishonest" , "Not genuine, feigned" , "Feigned, smarmy" .)