As the error of the sinner’s prayer continues to compound, sinners are sometimes encouraged to pray, “Jesus, I now make you the Lord of my life” to be saved. The problem with telling Him you’ll make Him the Lord of your life in salvation prayer is that, when you make Him your Lord, you’re promising to obey Him. The Lord once asked His apostles,
“Why call ye Me, Lord, Lord, and do not the things which I say?” (Luke 6:46).
Now, if a sinner genuinely believes the gospel, but is coaxed into promising to do what the Lord says by promising to make Him his Lord, he IS saved. But what happens when later he doesn’t do the things the Lord says? If he promised to make Christ his Lord to be saved, and then disappoints Him, he is likely to wonder if he is truly saved.
Beloved, don’t confuse a sinner into promising to make Christ his Lord when all you want him to do is receive Christ as his Savior. If you do, you confuse letting Christ save him from his sins with what he is supposed to do in response to Christ saving him from his sins. After telling the Ephesians that they were saved by grace through faith (Eph. 2:8,9), Paul added,
“For we are His workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them” (Eph. 2:10).
When a sinner gets saved, God makes him “a new creature” in Christ (2 Cor. 5:17), and he is “created in Christ Jesus unto good works.” That is God’s purpose in making him a new creature.
But notice Paul doesn’t say that a new creature must walk in good works, he says that he should. To say that he must is something we hear from those who believe in what is called Lordship Salvation, yet another error that is linked to the sinner’s prayer when sinners promise to make Christ the Lord of their lives to get saved. source