I just created a presentation to explain that.
Fig 1. We see human life, vulnerable to death, destructable by death.
Fig 2. Here we see divine life, "rock-hard". If the gear of death was to grind it, the gear would break, not the rock of divine life. Yet, divine life does not go to death of its own nature.
Fig 3. In the person of Jesus Christ, divine life and human life are united without mixture. But when divine life follows human life to its tragic end, the gear of death cannot grind it and breaks. Human life is now attached to divine life and can no longer be destroyed. Matter still can, but life itself can't. Death is defeated. Resurrection will "just" be the assignement of new glorified matter to life that was preserved.
Incarnation, therefore, is not only the birth, but union in all phases: birth, life and death. Only that way divine life can destroy death by "jumping into it", or "killing death by Its own death".
Notice that the Second Person, the Son, has all the divinity if we consider length as a symbol of divinity. It has just one third of the height, though, because it's just one of the Three Persons. Human nature, though, is almost completely taken into the Secon Person, except for our sins.
Our human conscience, can be inside the person of Jesus after the resurrection (that'll be Heaven), or outside, with our sins (that'll be Hell).
By the way, that is the universal aspect of salvation, regardless of faith. You don't have to be in the church to gain that kind of immortality. It's already done, our nature and God's united in Jesus Christ. The Church is something entirely different.
I have two questions:
1. Why was Christ's death and resurrection necessary, if through His Incarnation, he already abolished the dichotomy between man and God through the hypostatic union of his humanity and divinity?
2. Without penal substitution and satisfaction, how is our sin, apart from the notion of death which is addressed by Christus Victor, gotten rid of?
Please I don't want to start an argument about Orthodoxy v Catholicism and Western captivity, etc...