If the original father Adam is a copy of the Creator, his son Cain is certainly a copy of God's son Satan, and this gives us good reason for supposing that God's favourite, Abel, must also have his correspondence in a 'supracelestial place.'
Jung argues that the Cain–Satan homology is structurally necessary: the dualism suppressed in monotheism resurfaces as fratricidal opposition, making the Fall and fratricide symptomatic of a metaphysical disunity immanent in creation itself.
, Psychology and Religion: West and East, 1958thesis