Religious folk understand about eternities (7)

'religious folk' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'understand about eternities' is the wordplay.
'understand' becomes 'dig' (digging is a kind of understanding).
'about' shows that the letters should be reversed in order.
'eternities' becomes 'eons' (I've seen this in another clue).
'dig' backwards is 'gid'.
'gid'+'eons'='GIDEONS'

Can you help me to learn more?