Calvinism's "Repent of sins" idea is an unbiblical lie and heresy:

[1] Therefore leaving the principles of the doctrine of Christ, let us go on unto perfection; not laying again the foundation of repentance from dead works, and of faith toward God,
Hebrews 6:1 KJB

"Repent of sins"/turn from sins" is a work and does not save you:

And God saw their works, that they turned from their evil way; and God repented of the evil, that he had said that he would do unto them; and he did it not.
Jonah 3:10 KJB

By God's grace through faith on the risen Lord Jesus Christ, not our works, is what saves sinners.

  Ephesians   2:8 - 9   KJB
[8] For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: [9] not of works, lest any man should boast. 

  Galatians   2:16   KJB
[16] knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.

  Acts   16:31   KJB
[31] And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house. 

  Romans   10:9 - 11   KJB
[9] that if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. [10] For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. [11] For the scripture saith, Whosoever believeth on him shall not be ashamed.

@RepentOfSinsExamined