I've seen and heard this question asked numerous times before, and I've even wondered it myself in my earlier years as a new Christian.
Is there salvation for angels and can demons go back to their previous, uncorrupted state?
2 Corinthians 11:14
And no wonder! Even Satan disguises himself as an angel of light.
As far as scripture is concerned, Satan can pretend to be angelic for the sake of deceit, but that's about it. There's no mention of redemption for angels or demons — that's the long and short of it.
So let's explore four areas of Scripture to see what we do know.
#1 They have been imprisoned for judgement by God.
2 Peter 2:4
For if God did not spare the angels when they sinned, but cast them into Tartarus and committed them to chains (or pits) of deepest darkness to be kept until the judgment;
This judgement is eternal for them and there appears to be no second chance; their judgement is sealed:
Then he will say to those at his left hand, ‘You that are accursed, depart from me into the eternal fire prepared for the devil and his angels;
#2 They have been imprisoned for judgement by the saints.
Not only has God set a judgement, but we who are in Christ will have the role of actually judging the angels as well. How's that for a hefty responsibly!
1 Corinthians 6:3
Do you not know that we are to judge angels—to say nothing of ordinary matters?
#3 Judgement is final
We can also see from Revelation some more details about what this judgement entails for the devil and those who followed him:
And the beast was captured, and with it the false prophet who […] were thrown alive into the lake of fire that burns with sulfur.
And the devil who had deceived them was thrown into the lake of fire and sulfur, where the beast and the false prophet were, and they will be tormented day and night forever and ever.
#4 Salvation is for humans
Salvation appears to be only something that God designed for humans, and is apparently something that makes the angels curious.
1 Peter 1:12
[Salvation is the] good news by the Holy Spirit sent from heaven—things into which angels long to look!
Christ came as the "second Adam" (1 Cor 15:45) to rectify the problems caused by the first Adam. We humans are all "in Adam" (1 Cor 15:22), whereas angels are not. They are sometimes called "sons of God" — we are the son of Adam, therefore Jesus' sacrifice is only effective for "Adam". The writer of Hebrews sums this up for us nicely by saying, “it is clear that [Jesus] did not come to help angels”, but those in whom he shared a nature with — us! (Heb 2:14-16)
Whatever sins the angels have made (other than rebelling; cf. Rev 12:4,7-9) it is not covered by the blood of Jesus as far as we know. We can infer this from what Paul teaches us about the ministry of reconciliation:
2 Corinthians 5:19
that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting the message of reconciliation to us. (Emphasis mine)
The plan of salvation and the power of the Gospel to reconcile God and man appears to only apply to this world and our sins (or trespasses). The Greek word here for “world” is kosmos, which can sometimes have a broader meaning of “universe” or “creation” rather than just this planet, but in this context I'm not sure it allows for that scope of reconciliation, given the other passages of scripture we've seen about the rebellious angels (or demons) level of punishment.
Either way, Scripture doesn't give us any more information on this topic than that, so anything else would be speculation, but I think we can be reasonably certain that salvation through Christ is only for humans.
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