Deity takes Georgia to be an unbeliever (5)
I believe the answer is:
pagan
'unbeliever' is the definition.
(I've seen this before)
'deity takes georgia' is the wordplay.
'deity' becomes 'pan' (Pan is an example).
'takes' indicates putting letters inside.
'georgia' becomes 'GA' (abbreviation).
'pan' going around 'ga' is 'PAGAN'.
'to be an' is the link.
(Other definitions for pagan that I've seen before include "One who does not acknowledge a god" , "Person without any conventional religion" , "One outside the main religions" , "Unchristian" , "One who does not acknowledge your god(s)" .)