Religious group’s value? (12)
I believe the answer is:
denomination
This clue is a double definition.
'religious group's' is the first definition.
(as in a denomination within a church)
'value?' is the second definition.
(thesaurus)
(Other definitions for denomination that I've seen before include "Value of postage stamp; branch of religion" , "sect" , "Religious group - grade in series of designated values" , "Type of currency, religion etc" , "Face value of a banknote, coin or postage stamp" .)