You can't earn salvation as much as you can't buy love.
Repenting of sinning for Jesus' sake is not earning mercy, but is rewarded with mercy, even as the glorious Victor grants full pardon to them that unconditionally surrender to Him and His lordship.
And doing His service in works of His good pleasure and righteousness, is also rewarded as worthy of His eternal inheritance in the resurrection of the dead.
Rev
{3:4} Thou hast a few names even in Sardis which have not defiled their garments; and they shall walk with me in white: for they are worthy. {3:5} He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.
Collossians
{3:23} And whatsoever ye do, do [it] heartily, as to the Lord, and not unto men; {3:24} Knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ. {3:25} But he that doeth wrong shall receive for the wrong which he hath done: and there is no respect of persons.
2 Peter
{2:13} And shall receive the reward of unrighteousness, [as] they that count it pleasure to riot in the daytime. Spots [they are] and blemishes, sporting themselves with their own deceivings while they feast with you;
Rev
{16:5} And I heard the angel of the waters say, Thou art righteous, O Lord, which art, and wast, and shalt be, because thou hast judged thus. {16:6} For they have shed the blood of saints and prophets, and thou hast given them blood to drink; for they are worthy.
Continued unrepented unrighteousness unto the grave, is rewarded as worthy of everlasting shame from God in the resurrection. Less trespassing the Lord unto the grave, is no more worthy of His inheritance, than full rioteous living.
Indeed, the Lord would rather we be cold or hot, rather than lukewarm to His name. The cold can wholly repent, even as the wholly sought their own pleasure, but the half hearted satisfy themselves with a warm blanket for a less sinful bed.
Hosea
{7:8} Ephraim, he hath mixed himself among the people; Ephraim is a cake not turned.
"Progressive sanctification" is a term for spiritual growth in Christ,
It's a term used by the less sinful, for learning how to do less evil than before.
Growth in Christ Jesus is by disobeying God at all, not by sinful man's less often version.
only those who truly know Christ have that.
The rebuke of 1 John 1 to the lukewarm believer, is that there is no growth in Christ Jesus by disobeying the Father. Nor walking in His light, much less growing in the son's own example of obedience to the truth.
Only those who repent of all disobedience to the Father, have recieved the faith, knowledge, and blessedness of the Lord, that obeys and walks with Him at all times.
Sons of God only grow in Christ Jesus by learning obedience in all things, even as the Son Himself learned obedience as a man through the things which He suffered.
Heb
{5:8} Though he were a Son, yet learned he obedience by the things which he suffered; {5:9} And being made perfect, he became the author of eternal salvation unto all them that obey him;
Disobedience at any time toward God is not the Son's faith rewarded with His resurrection. It's only the faith of disobedient children with their own reward of shame and death toward God.
For those who reject Christ or play religion, they're not even sanctified in the first place,
True. Rejecting repentance from all sins and trespasses, is rejecting God's command to unconditionally surrender to His resurrected Son.
All other convenient incomplete repentance is play-play religion of the lukewarm.
Jerem
{3:10} And yet for all this her treacherous sister Judah hath not turned unto me with her whole heart, but feignedly, saith the LORD.
With the Lord, hardening ourselves to keep any sinful pleasures, is hardening ourselves to keep all pleasures of the world.
James
{2:10} For whosoever shall keep the whole law, and yet offend in one [point,] he is guilty of all. {2:11} For he that said, Do not commit adultery, said also, Do not kill. Now if thou commit no adultery, yet if thou kill, thou art become a transgressor of the law.
Faith to repent of some sinful pleasures, but not all, is man's own faith alone. It's not the faith of Jesus given only to them that repent with a whole heart, rather than only half-heartedly.
Collossians
{3:23} And whatsoever ye do, do [it] heartily, as to the Lord, and not unto men; {3:24} Knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ. {3:25} But he that doeth wrong shall receive for the wrong which he hath done: and there is no respect of persons.
they're those who practice lawlessness whom the Lord doesn't know.
Exactly. Anyone doing any lawlessness at any time, is a child of disobedience with the world, not an obedient son of God with the Lord.
The purpose of this doctrine is to rebuke the idea of "a golden ticket to heaven" or "God's insurance policy", it's not about work based religion.
True. Neither by works alone nor by faith alone, is any soul justified by Jesus Christ with the Father.
Doing works without the faith of Jesus from a pure heart, is man's own filthy rags to the Father. And faith without doing the works of God through the faith of Jesus, is dead to God.
The problem with lukewarm repenters, who never comletely repent to sin not in this life, is that they think their own lame sacrifice of conditional surrender to the victiorious Lord and true God, is acceptable to the Father.
A partially crucified old man and life, whether more or less, is not worthy of the whole burnt offering and sacrfice of God's dear Son unto death on a cross.
Romans
{6:6} Knowing this, that our old man is crucified with [him,] that the body of sin might be destroyed, that henceforth we should not serve sin.
Half crucified is half justified. It's the lukewarm gospel of man's sinful religion.
Matthew
{16:24} Then said Jesus unto his disciples, If any [man] will come after me, let him deny himself, and take up his cross, and follow me. {16:25} For whosoever will save his life shall lose it: and whosoever will lose his life for my sake shall find it.
Half lost is half saved. It's by one's own faith alone, not by the faith of Jesus Christ.