The recipe is not some supernatural phenomenon, which cannot be be observed or demonstrated. The panacea is genuine repentance with honest intention not to repeat the mistake or the sin. Firstly, I will introduce two small booklets by the Founder of the Ahmadiyya Muslim Community, the Messiah, Mirza Ghulam Ahmad Qadiani. Secondly, I will show the effectiveness of the recipe by borrowing a metaphor from Alcohol Anonymous. In this article and the booklets attached, the reader will find an adequate presentation of the Islamic view of how to be free from sin and refutation of the Christian dogma about atonement.
The Messiah, Mirza Ghulam Ahmad Qadiani, may peace be upon him, writes that man is by his very nature averse to things he believes to be harmful, and if he commits sin it is only because he does not truly believe in the existence of God and in the Day of Reckoning. Had he possessed the same certainty about the accountability of sin, as he does, for instance, about the harmfulness of a poison or a snake, he would never even think of transgressing Divine commandments.
The Messiah also argues that a true religion must be judged by its ability to lead its followers to certainty about the existence of God. The holy author makes a detailed comparison between Islam and other major religions, and concludes that Islam alone can lead man to perfect awareness and, consequently, to freedom from sin.
To read further please find click able links in the comment section below.
For Christians, To be Born Again in Islam! 
ziahshah
To read the book, How to be Free from Sin, click here.
To read an article by Zia H Shah MD: How to be Free from Addiction and Sin? click here.