Faultless conception of a particular religion? (10)
I believe the answer is:
immaculate
I believe this is a double definition.
'faultless' is the first definition.
(I know that faultless can be written as immaculate)
'conception of a particular religion?' is the second definition.
(I've seen this before)
(Other definitions for immaculate that I've seen before include "Dogma that the unborn Virgin Mary was preserved from all original sin" , "Faultless" , "Perfect" , "Spotless" , "Free from flaws" .)