Repentance to life is when we decide to be disciplined or not. Those who choose discipline start obeying Jesus' commands to walk in the Spirit. They believe in Jesus and obey His convictions.
1 John 3:22 And whatever we ask we receive from Him, because we keep His commandments and do those things that are pleasing in His sight. 23 And this is His commandment: that we should believe on the name of His Son Jesus Christ and love one another, as He gave us commandment. NKJV
They are keeping His commandments and doing things pleasing in His sight. They are doing things pleasing in His sight by walking in the Spirit.
John 14:21 He who has My commandments and keeps them, it is he who loves Me. And he who loves Me will be loved by My Father, and I will love him and manifest Myself to him." NKJV
If we keep His commandments Jesus and the Father both love the person that keeps Jesus' commandments. One of Jesus' commandments is to believe in Jesus.
John 10:9 I am the door. If anyone enters by Me, he will be saved, and will go in and out and find pasture. NKJV
Those who keep Jesus' commandments have eternal life in heaven because Jesus is the door. I don't care how many scriptures you show me defining sin. Jesus says they have eternal life in good pasture.
John 14:6 Jesus said to him, "I am the way, the truth, and the life. No one comes to the Father except through Me. NKJV
They get to the Father, who loves them, through Jesus.