Christians who sin
are following the ruler of this world. His name is Satan. The sons of
disobedience are the ones who
disobey God’s commandments. This is why these former
sons of righteousness are now called
sons of disobedience. Those who sin do love their sin more than they love God. If they loved God more than the pleasure derived from their sin, then they would choose to not sin.
Those who truly love God do not sin which means that they choose to not sin against Him.
1 John 2:1-5
1 John 3:4-9
Whoever commits sin also commits lawlessness, and sin is lawlessness. 5 And you know that He was manifested to take away our sins, and in Him there is no sin. 6
Whoever abides in Him does not sin (chooses to not commit sin).
Whoever sins has neither seen Him nor known Him.
7 Little children, let no one deceive you. He who practices righteousness is righteous, just as He is righteous. 8 He who sins is of the devil, for the devil has sinned from the beginning. For this purpose the Son of God was manifested, that He might destroy the works of the devil. 9 Whoever has been born of God does not sin, for His seed remains in him; and he cannot sin, because he has been born of God.
If you commit sin, then you are breaking God’s laws. Whoever commits sin is committing lawlessness. If you truly love God,
then you do not sin (you do not sin because you
choose to not sin). If you commit sin, then you
are sinning.
I agree with you that no one can habitually practice sin and be saved.

However, only one mortal sin causes the death of spiritual life in our souls. The Holy Spirit will not live in a soul/temple defiled by mortal sin.
Judas committed one mortal sin when he betrayed our Lord. He repented of this sin.
Matthew 27:3-5 But, then he despaired and hung himself. This is another mortal sin because He believed that his sin was greater than God’s mercy. He sinned against the Holy Spirit when he hung himself because he insulted the Spirit of Grace by believing that God’s mercy was not great enough to save him. This is why Jesus stated that it would have been better if he had never been born.
Mark 14:21 It is better to never have been born than to suffer for eternity in hell.
If we are sinning, then the Spirit of God is definitely not working in us. The spirit of darkness is working in us instead because when we sin, then we are following the ways of the world and of the ruler of the kingdom of the air. We are not following God when we sin.
Ephesians 2:2
Ephesians 5:5-7
For this you know, that no fornicator, unclean person, nor covetous man, who is an idolater, has any inheritance in the kingdom of Christ and God. 6 Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience. 7
Therefore do not be partakers with them.
When we repent and are then baptized, Jesus forgives and atones for every single sin on our souls up to that point in time when we receive the cleansing of the baptismal waters. Adam’s sin and all of our own personal sins are taken care of for “free.” We do not have to atone for any of these personal sins. He does it all for us. He gives us a clean slate.
However, once we have been reconciled to God by the blood of Jesus applied to us through Baptism, then we have to repent and atone for every single personal sin we commit after that until the day we die.
We can receive His free gift of grace only once. Romans 5:18
Whenever we sin
after our reconciliation to God through baptism, then we are listening to the spirit of darkness and we are choosing to follow the ruler of the air.
If after our reconciliation to God through baptism, we are instead doing works of righteousness and are not doing sins of disobedience like breaking God’s commandments, then we are listening to the Spirit of Grace and He gives us more grace as a reward for our obedience to Him.