The main problem with sinners is that they don't look at sin as God does in Scripture.
To sinners sin is natural, normal, and to be expected.
Double minded Christians expect the same thing, while trying to teach righteousness as also now natural, normal, and to be expected.
However, in this world, sin of the devil is indeed the standard, nor righteousness of God.
In our sinful flesh, there is absolutely nothing natural and normal about doing the righteousness of God, but only about continuing in the sin.
And so, double minded Christians preach becoming 'good sinners', following Christ in certain things at times, and following the devil in certain things from time to time.
And yet all sin before God is unrighteousness, transgression, and of the devil.
Be ye angry, and sin not: let not the sun go down upon your wrath: Neither give place to the devil.
Committing sin is of the devil and is giving place to the devil: it is bowing down before the devil and worshipping him as lord.
Any sinners claiming Christ who sin from time to time, want to label it for what it really is? Worshipping the devil from time to time? Supping at the table of Belial from time to time?
And so, we see how sinners claiming Christ must downgrade sin to something much less evil.
They simply sin from time to time, since all sinners on earth do, and so as Christians they merely fall into sin from time to time.
Sinners know they are sinners and not saints, and saints know they are saints and not sinners, and the double minded Christians know they are still sinners and not just saints.
The only real difference between the two, is not forgiveness for one but not the other. No the real dirty little secret is that sinners claiming Christ, commit sins that don't stink as bad in the nostrils of the Lord as do real unsaved sinners.
Real sinners are really sinners, and real saints are really saints.
Sinners claiming Christ aren't really anything at all:
I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot. So then because thou art lukewarm, and neither cold nor hot, I will spue thee out of my mouth.
The only thing they really are is decieved about God's eternal salvation and themselves already having gotten it in the bag.
They celebrate being so rich in grace, that they have no need to repent of all their sins, because they've already been forgiven of them in the past.
Because thou sayest, I am rich, and increased with goods, and have need of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked: I counsel thee to buy of me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see.
As many as I love, I rebuke and chasten: be zealous therefore, and repent.
Even as sin is not a plaything with God, nor is repenting a mind game with sin.