I am afraid my interpretation is correct.
It appears you partly agree with me. You are saying Paul obeyed the law flawlessly was not in regards to the moral law, but it was in regards to Pharisee's ritual laws, or traditions, etc.
Which law does being a blasphemer and violent man break? The moral law. No Paul could not faultlessly obey all the law for he broke the moral law as you have noted and rom 7:8 states.
The rest he faultlessly obeyed.
But we disagree on Romans 7. You believe the moral laws are abrogated in regards to a person's salvation and that by just believing in Jesus alone will provide the believer with some kind of obedience either appearance wise or that it will give them enough obedience to pass themselves off as being born again to others; However, they will also be found present as a sinner (Which to me is a contradiction in terms). You are either defined as being a born again person by your obedience to God (i.e. by not living in a bunch of horrible sins), or you are found present as a sinner. You can't have it both ways. You cannot serve two masters. For you will hate the one and love the other. Either one is serving God or they are serving sin. Serving God while still holding onto sin by declaring that one will sin again in the future is not serving God.
For who was the Law made for?
"Knowing this, that the law is not made for a righteous man, but for the lawless and disobedient, for the ungodly and for sinners, for unholy and profane, for murderers of fathers and murderers of mothers, for manslayers, For whoremongers, for them that defile themselves with mankind, for menstealers, for liars, for perjured persons, and if there be any other thing that is contrary to sound doctrine; According to the glorious gospel of the blessed God, which was committed to my trust. (1 Timothy 1:9-11).
"But we know that the law
is good, if a man use it lawfully (1 Timothy 1:8).
How can a person use the Law in a lawful way?
Well, the law has changed (Hebrews 7:12).
But that does not mean God's moral laws have been aprogated. God's eternal moral laws have been carried over into the New. For Paul himself says if we love our neighbor it fulfills the Law, i.e. the moral laws such as not coveting, not stealing, etc. (See Romans 13:8-10).
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