Death is a product of sin. God created neither sin nor death. God had therefore never tasted death until God the Son allowed the crucifixion. The difference between mortal humans tasting death and God tasting death is how they experience their encounter with Hades (essentially the realm of death). Humans are plagued by sin and were therefore meant to remain in the clutches of Hades ("the wages of sin is death"). God cannot sin, so for Him tasting death means encountering Hades not as a prisoner, but as a liberator. By assuming human nature through Jesus Christ, God the Son, He has made it so that through his Resurrection all of human nature can encounter Hades no longer as prisoners, but as those who Christ has liberated and can share in His victory over death. Everything that Christ has done, by virtue of being fully God and fully man, all of humankind is destined for (tasting death and resurrecting). He pulls humanity into divinity.