Has a feeling religious groups will contain unique selling point (8)
I believe the answer is:
suspects
'has a feeling' is the definition.
(to have a feeling can mean to suspect something)
'religious groups will contain unique selling point' is the wordplay.
'religious groups' becomes 'sects' (I've seen this in another clue).
'will contain' indicates putting letters inside.
'unique selling point' becomes 'USP' (abbreviation).
'sects' going around 'usp' is 'SUSPECTS'.
(Other definitions for suspects that I've seen before include "Believes, supposes" , "They're believed to be guilty" , "Believes to be guilty but without proof" , "Considers or believes likely" , "Believes something might be true" .)