“Believe on the Lord Jesus Christ and thou shalt be saved”.
When the gospel is presented clearly and properly, the persons considering salvation will have had made clear them to that Jesus is God (Lord), that the Jesus of the Bible is the only Jesus that saves (and not another) and that He is the Christ.(the anointed one, the Messiah, the only means of salvation).
When the gospel is presented the Bible does not say, “You must make Jim Jesus”. He IS Jesus. When the gospel is presented the Bible does not say, “You must make Him Christ or Messiah or The Annointed One”. He IS Christ. Nor does it say, “You must make Him Lord”. He IS Lord.
Instead, The Lord Jesus Christ is to be presented as IN FACT, The Lord, Jesus and The Christ. It is not an offer for you to make Him any of these but an offer for you to receive salvation from and by means of The Lord Jesus Christ.
Hence, what occurs is that instead of focusing on presenting the gospel plainly and clearly regarding who the Lord Jesus Christ is, a preoccupation with what is going on in the minds of the person hearing the gospel is attempted. This is not anyone’s job, that is the Lord’s responsibility.
And this is a critical problem with “Lordship” salvation.
Believers are only commissioned to make the gospel clear, not control or manipulate the responses of others or micromanage their thought process.
If you have been faithful to clearly communicate “The Lord Jesus Christ” then with the person who says “I believe”, you can know with certainty they believe on “The Lord Jesus Christ”.
You cannot and do not have to power to “make Him Lord” any more than you have the power to “make Him Christ” or “make Him Jesus”. The Bible does not treat these as potentials but as certain facts that you are to believe or not to believe.
If you do not believe Jesus is God then you are not a candidate for salvation. If you do not believe Jesus was or is Jesus, you are not a candidate for salvation. If you do not believe He is The Christ, you are not a candidate for salvation. They are the inseparable realities of the gospel.