Christians have ceased from sin, as scripture (1Pet 4:1, 1John 3:9) states.
Rom 8:33
Who shall lay any thing (this includes sin) to the charge of God's elect?
What "sin" are you thinking Christians can still be charged with?
Is it unrighteousness (1John 5:17)?
But our faith is counted for righteousness (Rom 4:5), not obedience to the law.
Is it transgression of the law (1John 3:4)?
But Christians are not under the law (Rom 8:2, Rom 10:4, Gal 3:24, Gal 5:18, 1Tim 1:9).
Whatever the law says it says to those under it, Rom 3:19.
If I am understanding you correctly above here, you have not ceased or stopped from sin. But you believe that you are not capable of being charged with sin because you believe Jesus took away all your sin (i.e. including future sin). Am I correct? Yes?
If that is your interpretation of these passages, let's go over some of them.
1 Peter 4:1 means we have ceased or stopped from sinning as an action or performance of sinning as a way of life. It doesn't mean you don't sin when you sin. Verse 3 says, for the time of our past life (when we were unbelievers), we used to walk in lasciviousness, lusts, and idolatries, etc. Verse 4 says others (who are in the flesh) think it strange that we run not with them anymore. In other words, we do not perform sinful things as a way of life with others is talking about an action. Cease means to stop. 1 John 3:9 is talking about how the person who is born of God does not commit habitual sin as a way of life anymore. Please look at various translations for 1 John 3:9. Also, look at 1 John 3:10. It says the children of God and the children of the devil are manifest in the fact that whosoever doeth not righteousness is not of God, neither is he that loveth not his brother. So again, it's talking about an action. If you do not do righteousness and you don't love your brother you are not of God. That's what it means.
Now, you said what sin do you think Christians can be charged with? Uh, willful sin.
Hebres 10:26 says if we willfully sin after we have received the knowledge of the truth, there remaineth no more sacrifice for sins. Verse 38 says, the just shall live by faith: but if any man draw back, my soul shall have no pleasure in him. So yes, sin can be charged to the believer according to Hebrews 10.
So when you quote 1 John 5:17, you have to read it in context to verse 19 that says the whole world lies in wickedness while we are of God. Again, this is making a contrast between how a believer lives and how an unbeliever lives. For verse 21 says we are to keep ourselves from idols. If you believe a "Sin and still be saved" doctrine is in view here, then why warn the brethren against idols? Why say the whole world lies in wickedness when no one would be able to tell you apart from the world?
Romans 4 is talking about Justification and or coming to the faith. It is in context to how when you repent and accept Christ, Jesus imputes His righteousness to you. However, this does not allow you to continue in sin, though. Paul addresses that in Romans 6. For shall we continue in sin because we are not under the Law? Paul replies to that question, with: "God forbid." Meaning you are not allowed to do so. Paul then continues to say in Romans 6 that you are a servant to whom you obey whether sin unto death or obedience unto righteousness. Jesus believes you can only serve two masters. Jesus says a good tree cannot bring forth bad fruit (and vise versa). For we will know false prophets by their fruit. Peter says the false prophets are those who have eyes full of adultery and have not ceased from sin (2 Peter 2:1, 14). Meaning, they are sinning as a way of life still. They are still sinning like the world all the time. They are stilll iiving in wickedness.
Christians repented of dead works of self-righteousness (sin) when we received Christ.
Heb 6:1
Therefore leaving the principles of the doctrine of Christ, let us go on unto perfection; not laying again the foundation of repentance from dead works
This was a once only repentance, Heb 6:4-6
For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
And have tasted the good word of God, and the powers of the world to come,
If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
This is what Christian repented of. Thus there is no continual repentance again, and again, and again, as some incorrectly teach.
As for your view of Hebrews 6: This is talking about apostasy. Hebrews 6:1 is not talking about a one time repentance. It doesn't say that. It is saying from a Hebrew's perspective (Who used to justify themselves by the Law) in how they repented of the dead works in fact that they used to falsely obey the Law of Moses so as to be saved in their past life before they became a Christian or a believer in Jesus Christ. They have repented of those dead works. Verse 9 makes it clear that Hebrews 4-6 is a possibility. The author of Hebrews says, he is persuaded better things of those he is writing to concernign verses 4-6. So apostasy is still a possibility for the believer.
What minimum standard of good behaviour (or is it works of the law) are you claiming is needed to be saved?
And can you show details from scripture how "habitual" is determined in regards to sin (I presume you mean transgression of the law, 1John 3:4)?
Is it 7x70 offences?
It's important that we get these details right from scripture because according to the doctrine you follow our salvation depends on how good lifestyle we live.
When you quote 1 John 3:4 you also have to look at the context. 1 John 3:8 says he that committeth sin is of the devil. Verse 14 says we have passed from death unto life because we love the brethren. He that loveth not his brother abideth in death. Meaning.... you cannot hate your brother or you are abiding in death. Verse 15 confirms this even more. It says, whosever hateth his brother is a murderer and ye know htat no murderer hath eternal life abiding in him. So yes, how you live will matter in your right standing with God. But again, a true beleiver obeyes the Lord out of love not because of their own self effort but because they have been changed spiritually by God in the fact that they repented of their sin (With a Godly sorrow) and have accepted Jesus as their Savior.
As for being forgiven 70 x 7: This is in reference to past sin and not future sin. Nowhere does the Bible ever say your future sin is forgiven you. 1 John 2:1 says we are to sin not. If any man sins, we have an advocate that we can go to named Jesus Christ. For if we confess our sin, he is faithful and just to forgiven us our sin and to cleanse us from all unrighteousness (1 John 1:9). For if we say we have fellowship with him and walk in darkness, we lie and do not the truth (1 John 1:6). But if we walk in the light as he is in the light, then the blood of Jesus Christ cleanses you from all sin (1 John 1:7). This is what Romans 8 is talking about, too. Romans 8:1 says, there is no condemnation to those who are in Christ Jesus who WALK AFTER THE SPIRIT and NOT AFTER THE FLESH. Romans 8:6 says to be carnally minded is death, but to be spiritually minded is life and peace.