God is into prayer a lot (8)
I believe the answer is:
plethora
'a lot' is the definition.
'god is into prayer' is the wordplay.
'god' becomes 'thor' (Thor is an example).
'is into' means one lot of letters goes inside another.
'prayer' becomes 'plea' (plea is a kind of prayer).
'thor' put within 'plea' is 'PLETHORA'.
(Other definitions for plethora that I've seen before include "opposite of scarcity" , "More than enough" , "Excessively large amount" , "flood" , "Large number" .)