God will let a believer walk in carnality for just so long. Then He will turn them over to satan for destruction of the flesh, but their soul will be saved
1 Timothy 1:20 Of whom is Hymenaeus and Alexander; whom I have
delivered unto Satan, that they may learn not to blaspheme.
1 Corinthians 5:
4 In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ,
5 To deliver such an
one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
Right here we see two incidents of carnal believers whom Paul says in 1 Timothy as God's Apostle he turned two believers who had turned from the truth thus walking in the flesh as carnal over to satan for destruction.
He told the Corinthians to turn the carnal believer over to satan for destruction of his flesh yet he would be saved that is his soul would be saved in the day of the Lord that is yet so as by fire.
While they walk in the flesh God is chastening
Hebrews 12:
5 And ye have forgotten the exhortation which speaketh unto you as unto children, My son,
despise not thou the chastening of the Lord, nor faint when thou art rebuked of him:
6
For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.
7 If ye endure chastening, God dealeth with you as with sons; for what son is he whom the father chasteneth not?
8 But if ye be without chastisement, whereof all are partakers, then are ye bastards, and not sons.
1 Corinthians 11:
32 But when we are judged,
we are chastened of the Lord, that we should not be condemned with the world.
Revelation 3:
19 As many as I love,
I rebuke and chasten: be zealous therefore, and repent.
Here again we see the carnal believer receiving chastening from the Lord, if they fail to repent they are turned over to satan for destruction of the flesh and that is the sin unto death.
Romans 6:
16 Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of
sin unto death, or of obedience unto righteousness?
1 John 5:16 If any man see his brother sin a sin which is not unto death, he shall ask, and he shall give him life for them that sin not unto death. There is a
sin unto death: I do not say that he shall pray for it.
The sin unto death is continuing to walk in carnality as a believer. When God will turn them over is up to Him, He will continue to chasten them but at some point He will allow satan to destroy their flesh and take them out.
Do you think it's worth continuing to walk in sin? I don't that is why I confess my sins when I commit them, to avoid chastening and to avoid the sin unto death.