If ‘god is great’ = ‘cp an bo’, ‘great help done’ = ‘er cp fs’ and ‘he is great’ = ‘bo cp dq’, then what represents ‘he is god’?

'great' is in all three sentences and 'cp' in all three codes, so great = cp. 'is' and 'great' are shared by the first and third, so is = bo. That leaves god = an (first sentence) and he = dq (third). So 'he is god' = dq bo an, i.e. an bo dq.