John 3:3-15 (NLT):
"Jesus replied, “I tell you the truth, unless you are born again, you cannot see the Kingdom of God.”
4 “What do you mean?” exclaimed Nicodemus. “How can an old man go back into his mother’s womb and be born again?”
5 Jesus replied, “I assure you, no one can enter the Kingdom of God without being born of water and the Spirit. 6 Humans can reproduce only human life, but the Holy Spirit gives birth to spiritual life. 7 So don’t be surprised when I say, ‘You must be born again.’ 8 The wind blows wherever it wants. Just as you can hear the wind but can’t tell where it comes from or where it is going, so you can’t explain how people are born of the Spirit.”
9 “How are these things possible?” Nicodemus asked.
10 Jesus replied, “You are a respected Jewish teacher, and yet you don’t understand these things? 11 I assure you, we tell you what we know and have seen, and yet you won’t believe our testimony. 12 But if you don’t believe me when I tell you about earthly things, how can you possibly believe if I tell you about heavenly things? 13 No one has ever gone to heaven and returned. But the Son of Man has come down from heaven. 14 And as Moses lifted up the bronze snake on a pole in the wilderness, so the Son of Man must be lifted up, 15 so that everyone who believes in him will have eternal life.
This spiritual rebirth puts to death your sinful nature's stronghold in your life. Even after becoming saved, you must battle your sinful nature daily and put it to death on a daily basis, however, the way it was able to dominate you before (i.e. before you became saved) will change dramatically when you yield to the Holy Ghost daily instead of yielding to your sinful nature.
Galatians 5:16-26 (NLT):
"So I say, let the Holy Spirit guide your lives. Then you won’t be doing what your sinful nature craves. 17 The sinful nature wants to do evil, which is just the opposite of what the Spirit wants. And the Spirit gives us desires that are the opposite of what the sinful nature desires. These two forces are constantly fighting each other, so you are not free to carry out your good intentions. 18 But when you are directed by the Spirit, you are not under obligation to the law of Moses.
19 When you follow the desires of your sinful nature, the results are very clear: sexual immorality, impurity, lustful pleasures, 20 idolatry, sorcery, hostility, quarreling, jealousy, outbursts of anger, selfish ambition, dissension, division, 21 envy, drunkenness, wild parties, and other sins like these. Let me tell you again, as I have before, that anyone living that sort of life will not inherit the Kingdom of God.
22 But the Holy Spirit produces this kind of fruit in our lives: love, joy, peace, patience, kindness, goodness, faithfulness, 23 gentleness, and self-control. There is no law against these things!
24 Those who belong to Christ Jesus have nailed the passions and desires of their sinful nature to his cross and crucified them there. 25 Since we are living by the Spirit, let us follow the Spirit’s leading in every part of our lives. 26 Let us not become conceited, or provoke one another, or be jealous of one another."
Romans 6:1-23 (NLT):
"Well then, should we keep on sinning so that God can show us more and more of his wonderful grace? 2 Of course not! Since we have died to sin, how can we continue to live in it? 3 Or have you forgotten that when we were joined with Christ Jesus in baptism, we joined him in his death? 4 For we died and were buried with Christ by baptism. And just as Christ was raised from the dead by the glorious power of the Father, now we also may live new lives.
5 Since we have been united with him in his death, we will also be raised to life as he was. 6 We know that our old sinful selves were crucified with Christ so that sin might lose its power in our lives. We are no longer slaves to sin. 7 For when we died with Christ we were set free from the power of sin. 8 And since we died with Christ, we know we will also live with him. 9 We are sure of this because Christ was raised from the dead, and he will never die again. Death no longer has any power over him. 10 When he died, he died once to break the power of sin. But now that he lives, he lives for the glory of God. 11 So you also should consider yourselves to be dead to the power of sin and alive to God through Christ Jesus.
12 Do not let sin control the way you live; do not give in to sinful desires. 13 Do not let any part of your body become an instrument of evil to serve sin. Instead, give yourselves completely to God, for you were dead, but now you have new life. So use your whole body as an instrument to do what is right for the glory of God. 14 Sin is no longer your master, for you no longer live under the requirements of the law. Instead, you live under the freedom of God’s grace.
15 Well then, since God’s grace has set us free from the law, does that mean we can go on sinning? Of course not! 16 Don’t you realize that you become the slave of whatever you choose to obey? You can be a slave to sin, which leads to death, or you can choose to obey God, which leads to righteous living. 17 Thank God! Once you were slaves of sin, but now you wholeheartedly obey this teaching we have given you. 18 Now you are free from your slavery to sin, and you have become slaves to righteous living.
19 Because of the weakness of your human nature, I am using the illustration of slavery to help you understand all this. Previously, you let yourselves be slaves to impurity and lawlessness, which led ever deeper into sin. Now you must give yourselves to be slaves to righteous living so that you will become holy.
20 When you were slaves to sin, you were free from the obligation to do right. 21 And what was the result? You are now ashamed of the things you used to do, things that end in eternal doom. 22 But now you are free from the power of sin and have become slaves of God. Now you do those things that lead to holiness and result in eternal life. 23 For the wages of sin is death, but the free gift of God is eternal life through Christ Jesus our Lord."
Romans 8:3-14 (NLT):
"The law of Moses was unable to save us because of the weakness of our sinful nature. So God did what the law could not do. He sent his own Son in a body like the bodies we sinners have. And in that body God declared an end to sin’s control over us by giving his Son as a sacrifice for our sins. 4 He did this so that the just requirement of the law would be fully satisfied for us, who no longer follow our sinful nature but instead follow the Spirit.
5 Those who are dominated by the sinful nature think about sinful things, but those who are controlled by the Holy Spirit think about things that please the Spirit. 6 So letting your sinful nature control your mind leads to death. But letting the Spirit control your mind leads to life and peace. 7 For the sinful nature is always hostile to God. It never did obey God’s laws, and it never will. 8 That’s why those who are still under the control of their sinful nature can never please God.
9 But you are not controlled by your sinful nature. You are controlled by the Spirit if you have the Spirit of God living in you. (And remember that those who do not have the Spirit of Christ living in them do not belong to him at all.) 10 And Christ lives within you, so even though your body will die because of sin, the Spirit gives you life because you have been made right with God. 11 The Spirit of God, who raised Jesus from the dead, lives in you. And just as God raised Christ Jesus from the dead, he will give life to your mortal bodies by this same Spirit living within you.
12 Therefore, dear brothers and sisters, you have no obligation to do what your sinful nature urges you to do. 13 For if you live by its dictates, you will die. But if through the power of the Spirit you put to death the deeds of your sinful nature, you will live. 14 For all who are led by the Spirit of God are children of God."
I've come across many carnal Christians who have been blinded by sociopathic ideologies like Calvinism and other similar Protestant ideologies. They think they can sin all they want without being held accountable for it by God. I've come across some of the most dangerous sociopaths among such groups because of the false doctrines they believe in. I've come across people who love starting conflicts between people that they don't like as well as mistreating people who they envy and hate. They think they are Christians when they behave as sociopaths. Nothing can be further from the truth as the Bible says a lot about such carnality. The Bible clearly teaches that such carnal "Christians" haven't passed the test of passing from spiritual death into eternal life. It's only when people demonstrate godly love and metanoia (turning away their old sinful behavior) through their thoughts and actions- they prove that they have passed from spiritual death into eternal life, and thereby passed the test which will save them from eternal destruction in the lake of fire and burning sulfur.
1 John 3:3-19 (NLT):
"And all who have this eager expectation will keep themselves pure, just as he is pure.
4 Everyone who sins is breaking God’s law, for all sin is contrary to the law of God. 5 And you know that Jesus came to take away our sins, and there is no sin in him. 6 Anyone who continues to live in him will not sin. But anyone who keeps on sinning does not know him or understand who he is.
7 Dear children, don’t let anyone deceive you about this: When people do what is right, it shows that they are righteous, even as Christ is righteous. 8 But when people keep on sinning, it shows that they belong to the devil, who has been sinning since the beginning. But the Son of God came to destroy the works of the devil. 9 Those who have been born into God’s family do not make a practice of sinning, because God’s life is in them. So they can’t keep on sinning, because they are children of God. 10 So now we can tell who are children of God and who are children of the devil. Anyone who does not live righteously and does not love other believers does not belong to God.
11 This is the message you have heard from the beginning: We should love one another. 12 We must not be like Cain, who belonged to the evil one and killed his brother. And why did he kill him? Because Cain had been doing what was evil, and his brother had been doing what was righteous. 13 So don’t be surprised, dear brothers and sisters, if the world hates you.
14 If we love our brothers and sisters who are believers, it proves that we have passed from death to life. But a person who has no love is still dead. 15 Anyone who hates another brother or sister is really a murderer at heart. And you know that murderers don’t have eternal life within them.
16 We know what real love is because Jesus gave up his life for us. So we also ought to give up our lives for our brothers and sisters. 17 If someone has enough money to live well and sees a brother or sister in need but shows no compassion—how can God’s love be in that person?
18 Dear children, let’s not merely say that we love each other; let us show the truth by our actions. 19 Our actions will show that we belong to the truth, so we will be confident when we stand before God."
Revelation 21:8 (NLT):
"But cowards, unbelievers, the corrupt, murderers, the immoral, those who practice witchcraft, idol worshipers, and all liars—their fate is in the fiery lake of burning sulfur. This is the second death.”
For more regarding salvation, please refer to my other post "What Must You Do To Be Saved?"