I suspect that God didn't.
It seems that we did. By our individual decisions to take the forbidden fruit (ego), we chose to fall from grace into the pit of darkness: physical reality.
When we chose to hold physical instrumentality as more important than God, we chose the impermanence of physicality and the pain of dichotomy -- action-reaction, good-evil, right-wrong, generous-selfish, compassion-indifference, confidence-doubt and many others of that Tree of Knowledge.
When we give up our attachments to this world, we accept the gift that Christ gave us to return to the Father.
Eternal death is the lack of continuity of consciousness, because we depend upon these Homo sapiens bodies for our consciousness. With spiritual reawakening, we regain our birthright of continuity of consciousness as a child of God and no longer need a physical body for that awareness.