I believe that being in this world ,we must apply the act of sanctification on our lives daily.
As some say to crucify the flesh daily.
Of that, you get no debate.
However, as to your posing the passage in 1 John, let me show you why your wrong.
"He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil. Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God." -1 John 3:8-9 (KJV)
Peter sinned, after the resurrection and after he was saved in that he directly disobeyed God:
"Arise, Peter; slay and eat. But I said, Not so, Lord: for nothing common or unclean hath at any time entered into my mouth. But the voice answered me again from heaven, What God hath cleansed, that call not thou common. And this was done three times: and all were drawn up again into heaven." -Acts 11:7-10 (KJV)
Three times in this passage, Peter disobeyed God.
In Antioch, Paul confronted Peter:
"But when Peter was come to Antioch, I withstood him to the face, because he was to be blamed. For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision. And the other Jews dissembled likewise with him; insomuch that Barnabas also was carried away with their dissimulation. But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?" -Gal. 2:11-14 (KJV)
Here, Paul accused Peter of being a hypocrite. And the scriptures says:"because he was to be blamed". Paul is saying Peter was guilty.
But lets not leave Paul out. Paul, being a Pharisee, educated at the feet of Gamaliel knew the Law, perhaps better than the Apostles but not as good as Jesus. When brought to the Sanhedrin, "the high priest Ananias commanded them that stood by him to smite him on the mouth." (Acts 23:2) To wit, Paul retorted:
"God shall smite thee, thou whited wall: for sittest thou to judge me after the law, and commandest me to be smitten contrary to the law? And they that stood by said, Revilest thou God's high priest? Then said Paul, I wist not, brethren, that he was the high priest: for it is written, Thou shalt not speak evil of the ruler of thy people." -Acts 23:3-5 (KJV)
This same Paul who said "To the Jew I become as a Jew that I might gain the Jews". Paul sinned in cursing the high Priest.
Earlier on, Paul was told:
"who said to Paul through the Spirit, that he should not go up to Jerusalem." -Acts 21:4 (KJV)
And afterwards:
"And as we tarried there many days, there came down from Judaea a certain prophet, named Agabus. And when he was come unto us, he took Paul's girdle, and bound his own hands and feet, and said, Thus saith the Holy Ghost, So shall the Jews at Jerusalem bind the man that owneth this girdle, and shall deliver him into the hands of the Gentiles." -Acts 21:10-11 (KJV)
Two perhaps three times, Paul disobeyed and sinned.
If we take 1 John 3:8-9 just as they say, we have no recourse than to say that Peter and Paul, Paul the one who wrote 66% of the New Testament, were not saved because after the point of salvation, they sinned.
There, you have your answer.
Sinless perfection, entire sanctification is a myth. But it shouldn't mean we shouldn't try.
Entire Sanctification, B.B. Warfield
How many times did Peter sin after the resurrection?
How many times did Paul sin after Jesus called him?
And what did Paul teach while he was on his way to Rome?
"
Now then it is no more I that do it, but sin that dwelleth in me. For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not. For the good that I would I do not: but the evil which I would not, that I do. Now if I do that I would not, it is no more I that do it,
but sin that dwelleth in me. I find then a law, that, when I would do good, evil is present with me. For I delight in the law of God after the inward man: But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members. O wretched man that I am! who shall deliver me from the body of this death? 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." -Rom. 7:17-25 (KJV)
Have you not sinned once since the point of salvation?
Are you so sanctified and filled with the Holy Spirit that
you cannot sin anymore?
If you are/have, then your better than the Apostles, for they couldn't do it!
God Bless
Till all are one.