The Sinners prayer is a false gospel of the modern day church movement. There is no such thing anywhere in the Bible as the Sinners Prayer. Many people today, confessing to be Christians, put the Sinners Prayer as the object of why they are saved and not Jesus. We are not suppose to put any faith or trust in anything other thing than the person and work of Jesus Christ Himself.
An altar call resulting in leading a person through the sinners prayer is what many church services end with. In fact this is even after there has been no gospel presented. How is this suppose to save someone when the Gospel is the power of God for salvation to everyone who believes?(Romans 1:18) This would make the Sinners Prayer some kind of get out of jail free card or a magic set of words to save a person.
I was a false convert for over 10 years of my life. I prayed the sinners prayer many times after walking an aisle. I was always confused on why there was not real change in my life. It turned out that the object of my faith was the Sinners Prayer. I was trusting in a decision and not Christ Jesus.
Jesus is the only way through which a person can be saved. God is Holy and no one besides God is good. So we have the problem of our sin before a Holy and Just God that will judge every single sin. Jesus paid for the sins of all who will believe in Him. He accomplished this by living a perfect live, dying on the cross, going to the grave, and rising on the third day. If a person puts their faith alone in Jesus Christ they will be saved. Do not put your trust in anything you or someone besides Jesus has done. A person is regenerated by the Holy Spirit (Born Again) through hearing the gospel. Once a person is born again they will repent and believe the gospel. If it is not a life of repentance and belief unto the end they were never saved in the first place. Only those who endure to the end, through the power of the Holy Spirit, will be saved.
The teaching that salvation is gained by asking God to save you or by asking Jesus to come into your heart is wrong. Also repeating a certain group of right words or saying a certain prayer will not guarantee a person is saved. Salvation is given to a person because of their repentant faith alone in the person and work of Jesus Christ upon the cross without praying a prayer.
Here are some recommended videos on the sinners prayer: