You are simply not addressing the verses I posted to you. Please do so. Then we can talk about God's grace and forgiveness.
I am addressing them in the way I know how - but cutting to the chase of what it means for people in the real world, who have to deal with their own weakness and the weaknesses of others on a constant basis.
There is strong exhortatory language, particularly from certain Apostles, about what being a Christian means. That's all good - it's good to be encouraged, to strive to be better than we are. But that very easily and readily slips over the edge of unreality among Christians, including Christians all over this site, into the absolutely absurd and counterfactual fantasy that BECAUSE people are Christians they do not sin. Or even that the fact somebody is a Christian MEANS that he is incapable of sin, and that therefore if somebody sins he isn't REALLY a Christian. This is of a piece with quoting St. Paul's "all have sinned" to mean that every human being who has ever lived, except for Jesus, has sinned.
That's what he literally said, but if he is taken literally then it is preposterous and he was a fool. Little babies - little children - have not sinned. They're people, and they haven't sinned. They're innocent, and if they die - whether they're growing up under parents who are Christians, Muslims, atheists, Nazis, Satan worshippers - doesn't matter - they have never sinned, and therefore they all pass final judgment - there's nothing to judge and - spotless - they are great indeed in the City of God at the end, and enjoy Gan Eden - Paradise - until the end.
The Apostles seem to say many things. Those things are hortatory. That's fine. But if taken absolutely literally, they blot out Christ, and they blot out reality, and they destroy the Christian religion by turning it into an obvious babbling stream of untruths.
Christians DO sin. That's a fact. Any Christian who tells you he doesn't is a liar - and has sinned right there. They may not sin AS MUCH as they did before, but they sin nevertheless. Being Christian does NOT immunize anybody from committing sin. In fact, it may draw in the demons for a closer and harder attack. We cannot lose sight of the good, the right and the just, and that has been revealed to us by God, by Jesus, by the Holy Spirit, by the Apostles, by the saints, by angels - all through the ages. We know what it is. And we know that we fall short of it.
So, to read the Scriptures in a way to suggest that reality isn't so - that Chistians don't sin - is to uproot reality and destroy Christianity. Because every honest Christian is aware of, and sensitive to, his own sins, the issue is not that he doesn't. He does. The issue is not that he can't sin. He can, and he does.
The issue is: I messed up, forgive me. THAT is the central issue of Christianity. Not the exhortation not to sin, but the forgiveness of God, and one another, the mercy God shows and that we are to show BECAUSE we are weak creatures that sin, err, make mistakes.
Everybody has a Dutch aunt who is hellbent - I use the word advisedly - on focusing on the blame, and focusing on perfection. Such people are repellent. They think it is because their purity drives off sin. Truth is, their hypocrisy drives off Christians, and drives off people from becoming Christians.
So here I have directly addressed what you quoted. First, almost all of it is from Apostles. Apostles are important teachers, but they are not God, their words are not as authoritative as the words of Jesus. Second, the Apostolic commentary is hortatory - it urges us to be better than we are. And by striving, we CAN BE better than we are. In abstract theory we could be perfect. But in reality, we're not. So therefore, third, the "how to be forgiven" part - how to obtain God's mercy - is much more important than the exhortations not to sin - because we're GOING TO SIN, and we need help once we do to get out of the mess.
The trouble with the hortatory "don't sin", and the extent to which Christians exaggerate the degree to which we avoid sin is that it causes us to become judgmental and insensitive to others whom we need to forgive, not judge.
The forgiveness part of Christianity is the active ingredient. That sin and evil infect everything, including Christians, is obvious. The question is: what do we do about it? We can dream of perfection, but we're not going to achieve it, so as a practical reality we have to learn damage control. And damage control is what Jesus said: to be forgiven the virtually inevitable sins, one has to forgive others.
I keep coming back to that, and not the hortatory stuff, because the hortatory stuff is just that - hortatory, urging, optimistic. It's useful only in a general sense. What we actually NEED, since we sin, is forgiveness, so I concentrate on that.