I understand your theory about us being dead to sin.
I believe this is our destination, as in, by reinforcing the ways of the Spirit through obedience the passions and ways of life in the world go into the background.
But we are still physical creatures who have our weaknesses and need to choose the way of the spirit daily.
I have seen very spiritual men and women of God, discovering part of their life, attitudes they have turning them aside from the Lord. It is the sorting through ones emotional foundations and loyalties that often put the true foundations in ones life.
This is why the building of ones emotional life in the Lord is so important to seeing the promises and victory come to pass. It is also very hard because what we are is defined by our emotional reactions to things and how we then choose to proceed.
In my discussions with different people, there is a problem with associating how we feel with who we are. Listening to our internal discussions of what makes us react in one and then choose to bring something else in to our lives to bring balance is part of our walk.
Peter was a prime example of being impetious, claiming a great deal before he had worked out the real price. "I would die for you." "No, you will deny me 3 times in the next 8 hours or so."
Once we begin to see our emotional language in the context of the Spirit, I think then true victory can be achieved.
A lot of the people who talk miracles, prophecy, proof of God moving above things of the heart, have often been those who condemn me for talking about love and the heart. If the heart is not resolved, opened and the hurts healed, loneliness and cynicism resolved, the excuses for damaging others still remains which often leads to sin and self indulgence. I have seen church leaders in our local assembly be brought down through these very problems by adultery and pride.
I understand. Romans 6 gives a statement of fact - we ARE dead to sin. But then Paul further tells us to "reckon" ourselves dead to sin. It doesn't change the fact, only shows us how to live it out.
Our command once receiving the Holy Spirit is to not quench the Spirit. It is then, and only then, we can continue to love others as Christ loved us, and fulfill the righteous requirements of the law, and thereby not fall into sin.
The difference between the apostles and some of the posters and even church fathers as in "the quote" is the concept of what is "fact." Apostle: "you ARE dead to sin" vs. "you WILL ALWAYS sin." Apostle: "I say this so you WILL NOT sin" vs. "you WILL ALWAYS sin." Apostle: Victory vs. Defeat. Our choice of words is powerful for life or death.
When a person gets it into their head to look at others failures rather than what is Truth/Fact, unbelief in the mighty power of God sets in, and we forget the Spirit. Then not only our righteousness becomes filthy rags, rather than led of God, we don't have the strength to walk in deadness to sin, just common willpower which WILL ALWAYS fail us. We get it into our heads "I will always sin" and then fulfill our own curse. There will be people who disappoint us, but God never will. "I can do all things through Christ who strengthens me."
It is all about the Spirit in us, something that Peter didn't have at the time he denied Christ, only partial bestowments for ministry from Himself previously when Jesus would send them out to heal the sick and cast out demons. It wasn't until in John 20:21-22
after Christ had died and been resurrected victorious did He breathe on them to receive the Holy Spirit. At that time they went from head knowledge to spirit knowledge and were
born again of the Spirit. (Many in the Church today still only have head knowledge, never having repented of their sin to become dead to sin and born of the Spirit. We can't look to them for truth.) It is interesting that before, during the time he walked with Christ while Christ was still training him, Peter could say something only from God, "You are the Christ, the Son of the living God," and then turn around and say something from his own will and old nature, and Jesus would say "get behind Me, Satan". Only after receiving the Spirit/being born of the Spirit, did they never falter, even unto death for they lived the FACT.