God here is the major deity of the three major monotheistic religions. Hannula is a Christian and a Presbyterian, so his understand of God is heavily influenced by these traditions. Hannula sees in the lives of these Christian heroes God playing a central role. These people were used by God to spread the good news of the saving grace of Jesus Christ to a world of sinners. To satisfy the justice of God, a sacrifice was required and God so loved the world that He gave His only son as that sacrifice.
Trial and Triumph: Stories from Church History