Twice as many finally in non-religious community (5)
I believe the answer is:
civic
'community' is the definition.
(civic means relating to the community)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for civic that I've seen before include "This centre of town" , "Relating to a citizen" , "Relating to citizenship or public affairs" , "Relating to a city or town" , "Relating to citizens" .)