No, I am arguing quite the opposite. "with the heart man belevieth unto righteousness" BEFORE confession is made with the mouth or else there is NOTHING TO CONFESS!
The sinner's prayer model REVERSES this order!
No it doesn't, and Paul clearly shows this in scripture.
Rom 10:13 For whosoever shall call upon the name of the Lord shall be saved.
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How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?
Paul implies here it is impossible for a person to call on Jesus unless they have first believed on him.
An athiest will not call on Jesus, because he does not believe the word of God. A Muslim believes Jesus is a prophet, but he does not believe Jesus was the Son of God who died for his sins and rose again, so he will not call on Jesus. I know this because I work with a Muslim from Yemen and have told him the gospel. He told me what they believe about Jesus.
A person who has been taught they must work their way to heaven is not trusting Jesus alone to save them. Paul warns of adding works to faith.
I don't know of anybody who asks persons to say the sinner's prayer without first preaching the gospel, maybe you do. When I got saved, they went through scripture to make sure I understood I was a lost sinner, that Jesus was the Son of God who died for my sins and rose again. They asked me if I BELIEVED this. I said yes, and only THEN did they ask if I would like to call upon Jesus to save me. I did.
If I had not first believed, I would not have prayed to Jesus.
But I don't know anybody that asks a person to say the sinner's prayer without FIRST preaching the gospel. Do you?