I read the entire thread and there were some points you made which stood out to me so I'm making a general post in response to several things you said.
I just want to point out to you, the sin nature won't leave any one permanently until our bodies are dead and passed on to the next life because the sin nature is in our flesh..
Justification is immediate and complete upon our salvation, but our sanctification, while had in part at the time of our salvation, is an ongoing continual process that will last our whole lives. Hebrews 10:14
And we will never be perfect until we pass from this life to the next and our sin nature (our flesh) is gone. This is why we so look forward to our glorified bodies, in them the fight against flesh ends.
It is very difficult to understand John because of the poetic nature of his writing.. John highlights the dichotomy, everything is either / or, which is fine it's a writing style to show a contrast which we need to see.
But of course, then John goes on and tells you that to know whether or not your saved you must look at whether or not you have love for your brother. He never once said to look at whether or not you stopped committing sins to have surety in your salvation.
The goal is to become like the Master.. but it's a process of sanctification which takes time. It's not overnight, and the Bible doesn't teach instantaneous "goodness" (for lack of a better word atm) at the point of salvation.
It's clear Paul speaks of a warring nature in believers because he talks about flesh being opposed to Spirit - in someone without the Spirit of God or conviction from God there is no opposition between their flesh and their spirit because they do not have a Godly spirit, they have a fleshly one.
Your having some misunderstandings, and they begin with you believing sanctification is a one time thing and not a continual process - that error is where people deviate from the Bible and start believing in sinless perfection and teaching things that aren't even in the Bible such as your sin nature is completely removed at salvation..
I understand you do seem to really believe all this but I do think it might do you well to really pray on why you have to search high and low to come across a church who is teaching what you want to hear where concerns sinlessness.