If I may . . . while again reminding, I'm not settled on this issue still, and I don't have a dog in the fight.
Why did Christ have to die?
Because only death will separate me from my flesh. My own death would simply be followed by judgement, so I'd be toast, and that doesn't help me.
However . . . and this is too mystical for me to say more about . . . we are able to be brought through death safely, that is, the separation from our flesh, by being able to join with Christ in His death. In His resurrection we remain joined to Him, and so we too live, but a new kind of life.
Our death in Him, the separation of us from our flesh, can only be accomplished if He died.
When He died, all sin was put on Him, and died with Him, the Lamb of God who bears away the sin of the world.
Jesus tasted death for us, impervious to it's sting, now we don't have to taste that same taste, and though we die, we live, "he who lives and believes in Me shall never die".
@John Caldwell
Still getting it here?
Much love!