First we are off topic and need to get this thread back on topic.
Second, you are not being logical.
If you wanted a debate on OS then we would go to the appropriate thread and I would post Psalm 51:5 where we could do battle over the interpretation of that verse, as we have in the past. We both disagree on the interpretation, but not only do we disagree, I believe it teaches OS and you don't, and thus the debate.
Here it is different. You want to debate this topic. You don't believe in OS, and I don't believe this verse teaches OS, so there is nothing to debate. We may differ on the interpretation of the verse, but that has no relevancy on the debate of OS, since I don't believe this passage has anything whatsoever to do with OS. It is totally irrelevant. There is no debate here.
As to the OP.
It is impossible for on to be saved under the law. Gal.3:10
If a man could perfectly keep the whole law for his entire life, he would not be lost. This is why Jesus spoke of persons who need no repentance.
Gal 3:10 is simply accepting as FACT that no man has ever, or will ever perfectly keep the law, therefore no man can by saved by the law.
Gal 3:10 For as many as are of the works of the law are under the curse: for it is written,
Cursed is every one that continueth not in all things which are written in the book of the law to do them.
11 But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith.
If a man is cursed that continues not in ALL THINGS which are written in the law to do them, then the opposite is true, a man who continues in all things written in the law to do them is not cursed.
When the young rich ruler asked Jesus what he must do to inherit eternal life, Jesus did not tell him he could do nothing, Jesus brought up the law.
Mar 10:17 And when he was gone forth into the way, there came one running, and kneeled to him, and asked him, Good Master, what shall I do that I may inherit eternal life?
18 And Jesus said unto him, Why callest thou me good? there is none good but one, that is, God.
19 Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Defraud not, Honour thy father and mother.
If your interpretation of Gal 3:10 is correct, then Jesus's answer was a lie. A man could not inherit eternal life by keeping the commandments.
Luk 10:25 And, behold, a certain lawyer stood up, and tempted him, saying, Master, what shall I do to inherit eternal life?
26 He said unto him, What is written in the law? how readest thou?
27 And he answering said, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy strength, and with all thy mind; and thy neighbour as thyself.
28 And he said unto him,
Thou hast answered right: this do, and thou shalt live.
If your interpretation of Gal 3:10 is correct, then Jesus lied in Luke 10:28
If a man perfectly keeps the law his entire life he will not be lost. If a man is born dead in sin, then Luke 10:28 would also be a lie, for it would not matter if you kept the whole law. Do you see that?
No, the word of God had CONCLUDED all under sin.
Gal 3:22 But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe.