Your self- made religion is one that makes you always strive to be “ good enough” with your
Performance in Regard to the Law ( why ? Who knows ? “By The Works Of the Law, no man will be Justified) and when you have a Stumble, you MUST immediately make sure you Repent , lest you be thrown into Hell when you die...
Clearly, if anyone is a
worker / doer of iniquity, he will be cast into the furnace of everlasting fire (Matthew 13:41-42, Matthew 7:23, Matthew 25:41).
The works of the flesh are all things that if you work those works, you will be acting in violation of the law (Galatians 5:19-21); and also if you bear the fruit of the Spirit, there is no law that will condemn your behaviour. In other words, those who bear the fruit of the Spirit become law-abiding citizens of the kingdom of heaven (Galatians 5:16; see also Romans 8:4).
(And those who walk after the flesh, also shall not inherit the kingdom.)
It is a righteousness apart from the law that is nevertheless attested to by the law and the prophets (Romans 3:21) that it is righteousness indeed.
For we do not obtain it by attempting to keep a set of do's and don'ts (i.e. through law-keeping)...but we enter into it by a different venue.
We place our faith in Jesus and receive the Holy Spirit by that faith (Galatians 3:14). Then, as we bear the fruit of the Spirit, there will be no law that condemns our behaviour (Galatians 5:22-23); because there is no law that condemns the behaviour of love and goodness (which are only two of the aforementioned fruits of the Spirit).
Thus we become law-abiding citizens of the kingdom, not by attempting to obey a set of do's and don'ts; but because we bear the virtues of the Holy Spirit.
Thus, we find the objective truth that by the law is the knowledge of sin (Romans 3:20). We are shown that we are still sinners in need of a Saviour (from sin) when the law pinpoints our behaviour as evil. It is like the song goes:
"What's going on inside of me?...I despise my own behaviour...This only serves to confirm my suspicion...That I'm still a man in need of the Saviour."
Of course we still need Christ (see John 15:1-8) even if we are walking in freedom (John 8:31-36) and victory (1 Corinthians 15:57) over sin.
But the song in question indicates a person who has not yet been forgiven; and who needs Christ to even forgive them of their sins.
I would think that when a man is born again, he is made into a new creature in Christ (2 Corinthians 5:17 (kjv))...he is no longer inclined towards stumbling (Jude 1:24, 2 Peter 1:10, 1 John 2:10).
In 1 John 3:9, we find the concept that those who are born of God "cannot sin".
Hyperbole?
If so, then John is exaggerating to make a point.
What point?
That those who have been born again have made a 180-degree turn away from sin, death, hell, and satan, towards righteousness, life, heaven, and God.
They have REPENTED. So they are walking in a different direction than before. So that the following is true of them.
Pro 4:18, But the path of the just is as the shining light, that shineth more and more unto the perfect day.
Also, it should be clear that the holy scriptures dictate that if anyone ceases to walk in the Lord's goodness, they will be "cut off".
Rom 11:20, Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear:
Rom 11:21, For if God spared not the natural branches, take heed lest he also spare not thee.
Rom 11:22, Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.
It should also be clear that it is the teaching of scripture that the doers of the law shall be justified (Romans 2:13); while it is also true that we are not justified "by" the works of law (Romans 3:20, Galatians 2:16).