Will any christians dare to explain the contradictory bible verses I have listed?

I can see you are confused. Salvation is based on faith in Christ. True faith in Christ produces good works, they go hand in hand. To repent means to turn from your own ways and to live for God. This is something you can 't do on your own, the Spirit of God helps you to live for God. Repent doesn't mean you will never sin again, for all sin, we live in an fallen world. However, faith in Christ cleanses us from the guilt and shame of sin. Trusting in Christ for salvation is the way to Heaven. Do good works is a sign of your salvation. Are you aware that the great sin in the Garden of Eden was Satan twisting scripture to prove God was unreliable. Don't fall for the lie, God is very reliable.