1Jn 3:4 Everyone who practices sin also practices lawlessness; and sin is lawlessness. 5 You know that He appeared in order to take away sins; and in Him there is no sin. 6 No one who abides in Him sins; no one who sins has seen Him or knows Him. 7 Little children, make sure no one deceives you; the one who practices righteousness is righteous, just as He is righteous; 8 the one who practices sin is of the devil; for the devil has sinned from the beginning. The Son of God appeared for this purpose, to destroy the works of the devil. 9 No one who is born of God practices sin, because His seed abides in him; and he cannot sin, because he is born of God. 10 By this the children of God and the children of the devil are obvious: anyone who does not practice righteousness is not of God, nor the one who does not love his brother.
Do you know why this is a fact? This is the way things are designed. If you are His, habitual practice of sin is an impossibility as it goes contrary to the very nature of God as our Father. If you are His, then He will step in and reprove you directly. If you do not see this reproof and can practice sinful behavior without consequences God says you are a "bastard" you aren't His contrary to your beliefs.
Heb 12:4 You have not yet resisted to the point of shedding blood in your striving against sin; 5 and you have forgotten the exhortation which is addressed to you as sons, "MY SON, DO NOT REGARD LIGHTLY THE DISCIPLINE OF THE LORD, NOR FAINT WHEN YOU ARE REPROVED BY HIM; 6 FOR THOSE WHOM THE LORD LOVES HE DISCIPLINES, AND HE SCOURGES EVERY SON WHOM HE RECEIVES." 7 It is for discipline that you endure; God deals with you as with sons; for what son is there whom his father does not discipline? 8 But if you are without discipline, of which all have become partakers, then you are illegitimate children and not sons. 9 Furthermore, we had earthly fathers to discipline us, and we respected them; shall we not much rather be subject to the Father of spirits, and live? 10 For they disciplined us for a short time as seemed best to them, but He disciplines us for our good, so that we may share His holiness. 11 All discipline for the moment seems not to be joyful, but sorrowful; yet to those who have been trained by it, afterwards it yields the peaceful fruit of righteousness. 12 Therefore, strengthen the hands that are weak and the knees that are feeble, 13 and make straight paths for your feet, so that the limb which is lame may not be put out of joint, but rather be healed.
Notice verse 13. The consequences for looking your Father in the eye and giving Him the finger can be very severe. But what are these disciplines from God, what do they look like? why do we get them if we are true Christians and choose to habitually disobey? Paul tells us ...
1Co 11:27 Therefore whoever eats the bread or drinks the cup of the Lord in an unworthy manner, shall be guilty of the body and the blood of the Lord. 28 But a man must examine himself, and in so doing he is to eat of the bread and drink of the cup. 29 For he who eats and drinks, eats and drinks judgment to himself if he does not judge the body rightly. 30 For this reason many among you are weak and sick, and a number sleep. 31 But if we judged ourselves rightly, we would not be judged. 32 But when we are judged, we are disciplined by the Lord so that we will not be condemned along with the world.
The consequences are listed in verse 30. Sickness, weakness and "sleep", often used of physical death while the soul is saved. But how can God "kill" His own kids? Doesn't He love them? The answer is, of course, yes. He loves the whole world. BUT, the options are, give them their consequences NOW, while they are alive, or judge them with the rest of the world, with eternal consequences ... So, if you misbehave enough, put His other kids at risk, or embarrass Him too much and He takes you home ... to heaven. Not much of a punishment, per say, but your life is over and your ability to serve Him on this planet ends as well. For an example of how this might play out let's go to 1Co. 5.
1Co 5:1 It is actually reported that there is immorality among you, and immorality of such a kind as does not exist even among the Gentiles, that someone has his father's wife. 2 You have become arrogant and have not mourned instead, so that the one who had done this deed would be removed from your midst. 3 For I, on my part, though absent in body but present in spirit, have already judged him who has so committed this, as though I were present. 4 In the name of our Lord Jesus, when you are assembled, and I with you in spirit, with the power of our Lord Jesus, 5 I have decided to deliver such a one to Satan for the destruction of his flesh, so that his spirit may be saved in the day of the Lord Jesus. 6 Your boasting is not good. Do you not know that a little leaven leavens the whole lump of dough? 7 Clean out the old leaven so that you may be a new lump, just as you are in fact unleavened. For Christ our Passover also has been sacrificed. 8 Therefore let us celebrate the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth. 9 I wrote you in my letter not to associate with immoral people; 10 I did not at all mean with the immoral people of this world, or with the covetous and swindlers, or with idolaters, for then you would have to go out of the world. 11 But actually, I wrote to you not to associate with any so-called brother if he is an immoral person, or covetous, or an idolater, or a reviler, or a drunkard, or a swindler--not even to eat with such a one. 12 For what have I to do with judging outsiders? Do you not judge those who are within the church? 13 But those who are outside, God judges. REMOVE THE WICKED MAN FROM AMONG YOURSELVES.
We have the command to, "While it is still today" go to any brother or sister we believe is sinning and reprove them with all doctrine and longsuffering looking to ourselves so we don't fall short, with the goal of restoring our brethren. If that fails we gather 1-2 others strong in the world, not telling them a thing about the situation other than you are in the second step of reproof (Any sharing of details is gossip) and let them bear witness of the "Doctrine and longsuffering" as you share yet again. You may find that those strong in the word disagree with you and that there is no sin to reprove... or what you have stated may be established. If you have won your brother, or is there was no sin in the first place all is restored. Otherwise you tell the entire church and have them all go with doctrine and longsuffering to try and win the brother or sister. If they repent, great. If not, then the steps above are to be taken. Paul even warned other churches of other brethren who fell short when they were removed from his local fellowship.
At that point, you have said, God, we have done all we can do. We deliver the man/woman into your hands to do what is best. And stop praying for them. Why? You are commanded to stop praying for them. Here's a related passage. Remember from 1Co. 11, the ways God disciplines people? Sickness, weakness ... sleep ...
1Jn 5:16 If anyone sees his brother committing a sin not leading to death, he shall ask and God will for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this. 17 All unrighteousness is sin, and there is a sin not leading to death.
At this point it's a no-prayer zone, other than, "God, your will be done in this person's life." Do not pray for his conversion, his repentance, ... because frankly God might keep them here striving even more with them while the destruction the non-repentant Christian is doing gets worse and worse damaging all around them. Give God the free hand. Let Him decide without your prayers interfering with His will. Yes He listens. But this is not the time to get in the way of a Father's reproof of His child.