What the Bible actually says
The Bible does not show Satan coming to God, confessing his sin, and asking for mercy. So it is wise not to claim more than Scripture tells us. It describes the devil as a liar and destroyer who did not remain in the truth (John 8:44).
From Eden onward, Satan appears as an enemy of God’s good purposes. The serpent deceives Eve in the garden, Satan tempts Jesus in the wilderness, and he is called the accuser of God’s people (Genesis 3:1-5; Matthew 4:1-3; Revelation 12:10). The pattern is not sorrow or return. It is persistent opposition.
Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
Mercy is not permission for evil
God is deeply merciful. He promises forgiveness to people who confess their sins, and Christ died for us while we were still sinners (1 John 1:9; Romans 5:8). No human being is beyond God’s call to repent and receive grace.
But forgiveness is not God pretending that rebellion does not matter. It means coming into the light and receiving his mercy. James tells believers to draw near to God and resist the devil, not to cooperate with his work (James 4:7-8).
We cannot see Satan’s heart as God does. Still, Scripture gives no sign that he seeks reconciliation. He is shown devouring, deceiving, and accusing (1 Peter 5:8; Revelation 12:9-10).
If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
His judgement is certain
Some questions about angels remain mysterious, but the Bible speaks clearly about Satan’s end. Jesus refers to everlasting fire prepared for the devil and his angels, and Revelation describes the devil’s final judgement (Matthew 25:41; Revelation 20:10).
Peter and Jude also speak of angels who sinned and are kept for judgement (2 Peter 2:4; Jude 1:6). These passages do not mean God is unwilling to be good. They show that evil will not rule forever. God will finally set things right.
And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever.
The hopeful part of the question
It can feel unsettling to think about Satan, but the Bible does not ask us to fixate on him. It points us to Christ. Jesus came to destroy the devil’s works, and God gives his people what they need to stand firm (1 John 3:8; Ephesians 6:11).
The contrast is hopeful. Satan’s story is marked by continuing rebellion and coming judgement. People, however, are invited to turn to God, be forgiven, and walk in the light. Bring this question honestly to God, and keep reading the Gospels, where Jesus’ authority over evil is unmistakable.