Have you ever noticed that at no time since the foundation of the world has God utterly destroyed a creature created in His image (angels & men)? God is eternal so anything made in His image (i.e. with a spirit) is also eternal. I think it’s a spiritual law once God has put His Spirit in something it cannot be unmade or destroyed. God cannot be mocked by violating His Word. God could destroy Satan and all the fallen angels with a word but chooses instead to one day incarcerate them in hell for eternity.
Man also becomes immortal at conception the instant God bestows on us an eternal spirit. Once our journey starts in the womb the die is cast. We have two possible eternal destinations, heaven or hell, and the choice must be made by us during our lifetime on earth. It’s up to each of us to seek out God and accept His grace unto eternal life through faith in Jesus Christ as our Lord and Savior. To reject God outright or even make no decision is to choose an eternity in hell being tormented 24/7. We have a binary choice, heaven or hell, and only a heartbeat separates us from both destinations.
Hebrews 9:27 – And it is appointed for men to die once, but after this the judgement.
Satan and his fallen angels sowed sin in heaven long ago and were thrown out. In the future they will reap an eternity in the lake of fire God made for them. In times past angels came to earth, took on human form and slept with women. Violating their estate was an abomination to God and those angels even now are chained up in the lower pits of hell awaiting God’s judgement. Those fallen angels sowed sin and will reap eternity in the same lake of fire as Satan. God never destroys what He has made but God is always just.