I have not suggested but joyfully proclaimed that Christ willingly took upon Himself the death, punishment and curse due to fallen humanity as the penalty for sin. Christians are already raised from the dead and already seated with Christ in the heavenly places (Romans 6:11 etc., Ephesians 2:6).
But there is something else that Christ has achieved for us on the cross.
'.....That through death He might destroy Him who had the power of death, that is, the devil' (Hebrews 2:14; cf. 1 John 3:8 etc.). Here I quote from Henri Blocher:
'How is Satan's role as the Accuser related to his power
? If Satan's opposition to the Lord were a matter of mere power, the rebel's finite resources would equal zero confronted with infinity. But the accuser can appeal to justice. He may also indulge in slander, but his force resides in the rightness of his accusation. Joshua is unclean; unspeakably unclean.......[Zechariah 3:1-3].
The righteous Judge of all the earth, who can only do right, cannot refuse to hear the charges the Accuser brings without denying Himself. In other words, the weapon in the devil's hand is God's own law - hence the association in some passages of the law and inimical powers which Aulen was not able to read aright.'
Satan appeals to God's justice, calling on Him to punish humanity as we deserve. That is why He is called 'the adversary' and 'the accuser of the brethren' (cf. Revelation 12:9-10). Consequently, the defeat of the devil must involve the removal of our guilt, and that is the way that the N.T. presents it. That is why Colossians 2:14-15 presents to us Christ's triumph on the cross to the cancellation of the bond of our debt by His substitutionary death upon the cross. Then all the principalities and powers, chif of whom was Satan, were 'disarmed.' They have nothing of which to accuse Christians because Christ has paid the penalty in full. So the
ransom paid by Christ to free us from the grasp of Satan was paid to God's justice. Now the ransom has been paid,
'There is now therefore no condemnation to those who are in Christ Jesus.' Satan is cast down.