Stop rejecting the heart of Jesus to become a believer (5)
I believe the answer is:
deist
'a believer' is the definition.
(person who believes in a god)
'stop rejecting the heart of jesus' is the wordplay.
'stop' becomes 'dei' (I can't justify this - if you can you should give a lot more credence to this answer).
'rejecting' is a reversal indicator.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'heart of' means to look at the middle letters.
The middle letter of 'jesus' is 's'.
't'+'s'='ts'
'ts' reversed gives 'st'.
'dei'+'st'='DEIST'
'to become' is the link.
Can you help me to learn more?
(Other definitions for deist that I've seen before include "Believer in the existence of god" , "Believer in a creator" , "I believe" , "Religious believer" , "Sort of believer" .)