This is nothing new here on TalkJesus. This comes around every year or two. It is of course a false doctrone of demons.
Basically.. it's the idea, that if I "believe in Jesus", I can do whatever I want, live however I want, and I'm still saved.

The serpent told Eve... go ahead and disobey God... you won't die. But she did.

The Bible teaches repentance is absolutely required. Being born again (dying to the old sinful ways) is absolutely necessary.

Practically the entire book of Jude is about this very subject.

Jude 1:3; Beloved, while I was making every effort to write you about our common salvation, I felt the necessity to write to you appealing that you contend earnestly for the faith which was once for all handed down to the saints.
Jude 1:4; For certain persons have crept in unnoticed, those who were long beforehand marked out for this condemnation, ungodly persons who turn the grace of our God into licentiousness and deny our only Master and Lord, Jesus Christ.

We have some of these "certain persons" here on TalkJesus right now. Who say the grace of Christ covers all your sins, so go ahead and sn all you want, it doesn't matter to God.

Jude 1:6; And angels who did not keep their own domain, but abandoned their proper abode, He has kept in eternal bonds under darkness for the judgment of the great day,
Jude 1:7; just as Sodom and Gomorrah and the cities around them, since they in the same way as these indulged in gross immorality and went after strange flesh, are exhibited as an example in undergoing the punishment of eternal fire.
Jude 1:8; Yet in the same way these men, also by dreaming, defile the flesh, and reject authority, and revile angelic majesties.

The fact that the angels abandoned God, and are enduring the punishment of eternal fire... as an example (to us) should deter us. We should know better.
We shouldn't be listening to these people.

Jude 1:19; These are the ones who cause divisions, worldly-minded, devoid of the Spirit.

They may have had the Spirit once, but they are devoid of the Spirit now.
The entire 2nd chapter of Peter is similar.

2Pet 2:1; But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.
2Pet 2:2; Many will follow their sensuality, and because of them the way of the truth will be maligned;

2Pet 2:14; having eyes full of adultery that never cease from sin, enticing unstable souls, having a heart trained in greed, accursed children;
2Pet 2:15; forsaking the right way, they have gone astray, having followed the way of Balaam, the son of Beor, who loved the wages of unrighteousness;

They themselves have gone astray, and they don't even know it. They have forsaken God, and they entice others to do the same.

2Pet 2:19 promising them freedom while they themselves are slaves of corruption; for by what a man is overcome, by this he is enslaved.
2Pet 2:20 For if, after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and are overcome, the last state has become worse for them than the first.
2Pet 2:21 For it would be better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment handed on to them.
2Pet 2:22 It has happened to them according to the true proverb, "A DOG RETURNS TO ITS OWN VOMIT," and, "A sow, after washing, returns to wallowing in the mire."

They speak of "freedom", while they themselves are slaves of corruption. Some people have escaped the ways and defilements of the world, only return right back to where they started.
Their last state has become worse for them than the first. It would have better for them not to have known the way of righteousness.

Instead of preaching that we should be righteous, they have become the Pharisees of this age.
Matt 23:15; "Woe to you, scribes and Pharisees, hypocrites, because you travel around on sea and land to make one proselyte; and when he becomes one, you make him twice as much a son of hell as yourselves.

Belief in Jesus alone doesn't save you. Even the demons believe.
Jas 2:19; You believe that God is one. You do well; the demons also believe, and shudder.

Obedience is tied to belief, you can't separate the two. If you continue in disobedience, you will face the wrath of God.

John 3:36; "He who believes in the Son has eternal life; but he who does not obey the Son will not see life, but the wrath of God abides on him."
Eph 5:6; Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience.
Col 3:6; For it is because of these things that the wrath of God will come upon the sons of disobedience,

If you haven't repented, and are still living a sin-ful life-style, you will not inherit the kingdom of God.
1Cor 6:9; Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals,
1Cor 6:10; nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, will inherit the kingdom of God.

It doesn't matter if you "believe in Jesus" or not.

Gal 5:19; Now the deeds of the flesh are evident, which are: immorality, impurity, sensuality,
Gal 5:20; idolatry, sorcery, enmities, strife, jealousy, outbursts of anger, disputes, dissensions, factions,
Gal 5:21; envying, drunkenness, carousing, and things like these, of which I forewarn you, just as I have forewarned you, that those who practice such things will not inherit the kingdom of God.

You may think you're secure in "the kingdom", but the Bible says some who are in the kingdom will be cast out.

Matt 8:11; "I say to you that many will come from east and west, and recline at the table with Abraham, Isaac and Jacob in the kingdom of heaven;
Matt 8:12; but the sons of the kingdom will be cast out into the outer darkness; in that place there will be weeping and gnashing of teeth."

Matt 13:40; "So just as the tares are gathered up and burned with fire, so shall it be at the end of the age.
Matt 13:41; "The Son of Man will send forth His angels, and they will gather out of His kingdom all stumbling blocks, and those who commit lawlessness,
Matt 13:42; and will throw them into the furnace of fire; in that place there will be weeping and gnashing of teeth.

Heb 10:26; For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins,
Heb 10:27; but a terrifying expectation of judgment and THE FURY OF A FIRE WHICH WILL CONSUME THE ADVERSARIES.

Luke 3:8; "Therefore bear fruits in keeping with repentance, and do not begin to say to yourselves, 'We have Abraham for our father,' for I say to you that from these stones God is able to raise up children to Abraham.
Luke 3:9; "Indeed the axe is already laid at the root of the trees; so every tree that does not bear good fruit is cut down and thrown into the fire."

Heb 6:4; For in the case of those who have once been enlightened and have tasted of the heavenly gift and have been made partakers of the Holy Spirit,
Heb 6:5; and have tasted the good word of God and the powers of the age to come,
Heb 6:6; and then have fallen away, it is impossible to renew them again to repentance, since they again crucify to themselves the Son of God and put Him to open shame.

Even if you've been a "partaker of the Holy Spirit". You can still fall away. Even if you have previously repented, you can't do it "again". (You can't do somethinf "again" unless you have done it at least once before).

This is just a small sampling of these verses, but in actuality, this is the entire theme of the New Testament.

Matt 5:20; "For I say to you that unless your righteousness surpasses that of the scribes and Pharisees, you will not enter the kingdom of heaven.

Luke 13:3; "I tell you, no, but unless you repent, you will all likewise perish.
Luke 13:5; "I tell you, no, but unless you repent, you will all likewise perish."

Acts 17:30; "Therefore having overlooked the times of ignorance, God is now declaring to men that all people everywhere should repent,