Here's the problem with what you're saying. Paul himself said that his flesh was still sinful, even after he was saved and working as an apostle -
Romans 7:25 "I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin." He is writing this WHILE he is an apostle for the Lord Jesus Christ; he himself said that he was still serving sin in his flesh, and the entire 7th chapter of Romans is about how he doesn't do that which he knows is right, or that which he shouldn't do, he does that instead, and that because of the law of God, sin has become extremely sinful in that we have knowledge of sin through the law. He says that he is wretched (present tense while being an apostle) because he cannot break free of sin in his flesh, but concludes by saying that he serves the law of God through Christ on his inward man, but on the outward man, still sins.
Most people in certain denominations who believe Romans 7 is about the Christian life, have not understood it in context. They zero in on verse 14 as a starting place, when 7 is the context that it is about
sin. Seeing as Jesus was manifest to TAKE AWAY OUR SIN, and in Him there is no sin 1 John 3:5, it is not about the Christian life, but about the life of one who was still under the law of sin and death
prior to life in the Spirit. It is mainly people in denominations affected by the Reformation that do not accept this truth John speaks of. Jude speaks against their ancestors of their belief as turning the grace of God into licentiousness. I would think Jude would say to RUN AWAY from those false doctrines of apathy toward sin, and who don't even believe they can be free. It is Satan that wants a person to be slaves of sin, and even though it is a fact that the desire to sin is gone when the Holy Spirit enters us, we must also believe this truth with our mind. Therefore, reckon yourself dead to sin, which is telling yourself the truth. Believing a lie will cripple a person's faith.
Those under the law could still sin because the law was weak as it did nothing about changing our inner man. Paul could relate to the feeling because he had been a Pharisee and knew the law inside out. Don't be fooled because it is present tense. That is a Semitic writing style we westerners are not used to. John did the same thing in 1 John 1:8, but both passages are about someone BEFORE Christ. Paul and John wrote in the present tense because they were Hebrews who always wrote that way, but by the context we know that 1 John 1:9 must be read with verse 8
to be saved; and Romans 7 must start at verse 7 (never 14) to know Paul is talking about those still in sin under the law
before Christ. Did you not see his question? "Who can save him" he asks? The answer is
Jesus. So if He is the answer to the problem, how can life in Him be the problem? It is not even logical.
Then he goes on to chapter 8 about the difference between the law and the Spirit.
Here is what most miss when reading Romans 7. It is about those still in sin. Who saves us from sin? The law, or Jesus? The law only showed us our sin causing the battle of knowing the law, and having no power to not sin. The Holy Spirit is where power comes from. And Jesus only gives those this power AFTER they have repented. Acts 2:38
7 What shall we say then?
Is the law sin? Certainly not! On the contrary, I would not have known sin except through the law. For I would not have known covetousness unless the law had said, “You shall not covet.” 8
But sin, taking opportunity by the commandment, produced in me all manner of evil desire. For apart from the law sin was dead. 9 I was alive once without the law, but when the commandment came, sin revived and I died. 10 And the commandment, which was to bring life, I found to bring death. 11 For sin, taking occasion by the commandment, deceived me, and by it killed me. 12 Therefore the law
is holy, and the commandment holy and just and good. 13 Has then what is good become death to me? Certainly not!
But sin, that it might appear sin, was producing death in me through what is good, so that sin through the commandment might become exceedingly sinful.
Now the contrast - chapter 8:1-9 (NKJV)
There is therefore now no condemnation to those who are in Christ Jesus, who do not walk according to the flesh, but according to the
Spirit. 2 For the
law of the Spirit of life in Christ Jesus has made me free from the law of sin and death. 3 For what the law could not do in that it was weak through the flesh, God did by sending His own Son in the likeness of sinful flesh, on account of sin: He condemned sin in the flesh, 4 that the righteous requirement of the law might be fulfilled in us who do not walk according to the flesh but according to the Spirit. 5 For those who live according to the flesh set their minds on the things of the flesh, but those
who live according to the Spirit, the things of the Spirit. 6 For to be carnally minded
is death, but to be spiritually minded
is life and peace. 7 Because the carnal mind
is enmity against God; for it is not subject to the law of God, nor indeed can be. 8 So then, those who are in the flesh cannot please God. 9
But you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is not His.
Now can you see that to believe we will always sin and there is no escape in this lifetime, only after, is being carnally minded? Shake off the lie and become spiritually minded.
This is why Romans 6 says we are dead to sin. Was Paul saying, everyone, but him? And the Spirit is the reason why John says in 1 John 3:9 "Whoever has been born of God does not sin, for His seed remains in him; and he cannot sin, because he has been born of God." Ask yourself, does a person who has been cleansed of ALL sin, still have sin? Therefore, 1 John 1:8 is not about the person in 1 John 3:9.