Grafted Into the Incarnation Why is a revelation of the Trinity core to our understanding of the nature of God? Unlike the unitarian concept of God that is directly based on our human performance to please him, instead we have been grafted into Jesus' relationship with the Father in the Spirit. Our relationship with God is fully mediated through the incarnate Son - our salvation rests completely on His faithfulness, His vicarious repentance on our behalf and His baptism into our death. God is family. He is other-giving love.