As to death already being completely defeated Davo, well, I am still seeing it all around me.
So, given the finished work of Christ, the full manifestation of the following promise still appears to be yet future :
1 Corinthians 15:22-28 (ESV)
22 For as in Adam all die, so also in Christ shall all be made alive. 23 But each in his own order: Christ the firstfruits, then at his coming those who belong to Christ. 24 Then comes the end, when he delivers the kingdom to God the Father after destroying every rule and every authority and power. 25 For he must reign until he has put all his enemies under his feet. 26 The last enemy to be destroyed is death. 27 For “God has put all things in subjection under his feet.” But when it says, “all things are put in subjection,” it is plain that he is excepted who put all things in subjection under him. 28 When all things are subjected to him, then the Son himself will also be subjected to him who put all things in subjection under him, that God may be all in all.
At present, we do not yet see everything in subjection to Christ, do we?
Hebrews 2:6-9 (ESV)
6 It has been testified somewhere,
“What is man, that you are mindful of him,
or the son of man, that you care for him?7 You made him for a little while lower than the angels;
you have crowned him with glory and honor,8 putting everything in subjection under his feet.”
Now in putting everything in subjection to him, he left nothing outside his control. At present, we do not yet see everything in subjection to him.
I like what this author says:
This passage is clear that all things have already been put under Jesus, but we don’t yet see them put under Jesus. The reason? Because of our individual and corporate “neglect” of “so great a salvation.” [Hebrews 2:3] Both Satan and Evil have no gasoline left in their tank because Jesus drained it all away at the Cross. They are functioning today solely off of the fumes of our neglect of Jesus’ great salvation. What makes this salvation so great is its “always already” aspect. The ministry of the Holy Spirit is to convince us of the accomplished benefits of this great salvation. “Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God.” 1 Cor. 2:12.
(From God vs. Evil, emphasis mine. )
Davo, I think we are all currently in a temporal classroom, and yet also seated with Christ in heavenly places outside time, in eternity. I believe humanity was crucified with Christ, buried with Christ, and is now seated with Christ; but that here within time, whether in life, or postmortem, each individual must, and will, repent and be born again:
1 Corinthians 15:22
For as in Adam ALL die, so also in Christ SHALL ALL be made alive.