On this earth, being saved lasts only as long as we are loving God with all the heart and obeying Jesus by faith, spiritually and bodily:
Having therefore these promises, dearly beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God.
And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ.
And being made perfect, he became the author of eternal salvation unto all them that obey him.
If we abide in Him and overcome temptation unto the end and the resurrection from the dead, then salvation is eternal with immortal spiritual bodies and perfected spirits:
To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect.
Those disobeying God are rejecting God and His deliverance from sinning.
Unto you therefore which believe he is precious: but unto them which be disobedient, the stone which the builders disallowed, the same is made the head of the corner,
And a stone of stumbling, and a rock of offence, even to them which stumble at the word, being disobedient: whereunto also they were appointed.
Those sinning with the devil, are not being sons of God, nor saved and justified by Jesus Christ:
He that is committing sin is of the devil; for the devil sins 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 is not committing sin; for his seed is remaining in him: and he cannot be sinning, because he is born of God.
Those who are doing unrighteous works of the flesh are the unrighteous, that are not inheriting the kingdom of God:
Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind, Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.
And such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God.
He that is doing the righteousness of God is the righteous in Christ Jesus, that are inheriting His kingdom:
Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.
One's own faith alone saves no man, but only those with the faith of Jesus, that loves and obeys God, saves the soul and justifies man.
Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
Jesus only gives the gift of His saving faith, to them that repent of sinning to love and obey Him from a pure heart.