I had people witnessing to me for years, about the love and forgiveness of God. But I just didn't believe, and I wasn't saved.
My future husband sat me down one day, and we talked about all the people in the Bible who repented of their sins. David, who was struck down in grief when Nathan pointed out his sins. Peter, when he denied Christ and wept bitterly, although Jesus, as usual, forgave him. Mary Magdelene, a prostitute who was so grateful that Jesus forgave her sins, that she took nard and wiped it on his feet.
That was the missing piece of the puzzle for me. God spoke to me, told me who he was, and saved me. I stopped drinking and many other things forever. It took the word of God, coupled with God drawing me near for God to truly save me. And turning from sin was part of that - God inspired, irresistible, but a confession and acknowledgment of sin!
Fast forward 31 years. I had been praying and witnessing that long to my father. And he was dying. My husband came for the daily visit, and I started talking about Jesus. My husband told my husband he needed to repent from his sins, by confessing them to God. That was the part of the missing puzzle he needed. My father came to know Jesus as Lord and Saviour, repented of his sins died a man who loved God, 5 months later. Before that time, God changed his heart in so many ways, and we totally reconciled.
Without repentance, no one is saved. Anyone pretending that they didn't turn away from their sins, is either lying, or has not read the truth about what we are saved from - from sin. And what we are saved to - to God!
As for "changing your mind" perhaps we need to change that to "changing MY mind." (Although there is no pronoun in the Greek!) So if repentance is just about ME, changing MY mind, that sounds a lot like works-righteousness, instead of the Holy Spirit prompting us to see our sins, and repent and turn away from them.
I have met too many people who think salvation is all about them. They "changed their minds." Then later, they changed it again, when the Christian walk got a little rough. Better to repent and turn away from your sins, because God leads you, than to take salvation into your own hands, by supposedly "changing MY mind" an act of self will if there ever was one! And an act that will never lead to salvation.
"My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous.2 He is the propitiation for our sins, and not for ours only but also for the sins of the whole world." 1 John 2:1-2
"And you were dead in the trespasses and sins2 in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience—3 among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind.4 But God, being rich in mercy, because of the great love with which he loved us,5 even when we were dead in our trespasses, made us alive together with Christ—by grace you have been saved—" Eph. 2:1-5
"He himself bore our sins in his body on the tree, that we might die to sin and live to righteousness. By his wounds you have been healed." 1 Peter 2:24
"And when he saw their faith, he said, “Man, your sins are forgiven you.” Luke 5:20
"And behold, some people brought to him a paralytic, lying on a bed. And when Jesus saw their faith, he said to the paralytic, “Take heart, my son; your sins are forgiven.” Matt 9:2
Jesus whole ministry was to call people to repentance for their sins, and he was born and died for the purpose of saving us from our sins.
"She will bear a son, and you shall call his name Jesus, for he will save his people from their sins.” Matt 1:21
"For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures." 1 Cor. 15:3
If anyone tells that repentance means something different than turning from your sins and towards God, flee them! That is another gospel!