I hold to the ideas described in the Bible regarding this matter.
Romans 6-8
1 John 1:5-2:1
Colossians 2:12-3:5
1 John 3
It seems pretty clear to me that we will live with the old sin nature, and the new spiritual nature, until death/rapture.
At which point the old nature will be gone and we will enjoy the new spiritual nature for eternity.
I think the problem is what people believe sin is.
1 John 3 says sin is lawlessness.
So, I'd say that the definition of sin goes back to the 10 commandments.
Reducing it further, Jesus said in Matthew 22:35-40 that the law and prophets are summed up in the 2 great commandments...
Love God with a whole heart, soul and mind, and love your neighbor as you love yourself.
Paul further sums this up in Romans 13:8-10...
Love is the fulfillment of the law.
So... can we live without violating the 10 commandments?
Can you not have a false god?
Can you not take the name of God in vain?
This is more than not using his name as a cuss word. It's not living in a manner that dishonors him.
Can you not have any other gods?
Can you take one day a week and rest/recuperate? To focus on, and worship God?
It doesn't HAVE to be Saturday. It can be any day. Romans 14, Colossians 2.
Can you honor your mother and father?
Can you not commit adultery/sexual immorality? Including the manner Jesus described? I.e., lust?
Can you not do murder? Including the manner Jesus described?
Can you not deceive?
Can you not steal?
Can you not be covetous? Lust, envy, greed, avarice,....
If you can live free of these, then you are living in agreement with the description given in 1 John 3.
Likewise, you're living in agreement with Galatians 5:16-25.
Paul tells us in Romans 8:4-8, that by focusing our thinking on spiritual things, we will... not JUST CAN... but actually WILL, fulfill the righteous ordinances of the law.
Why? Because according to Romans 7, the law is spiritual and we are carnal/natural and it requires spiritual life/power to satisfy the righteous requirements of the law.
I do believe that while I can choose to walk in the Spirit, and not violate the Law, I will have the old man, and by not walking in the spirit, I will walk in the flesh... and whatever my sin of choice is... I will engage in it.
Which is exactly why Jesus said to us...
Luk 14:27 WEBWhoever doesn’t bear his own cross and come after me, can’t be my disciple.
Luk 9:23 WEBHe said to all, “If anyone desires to come after me, let him deny himself, take up his cross, and follow me.
Mar 8:34 WEBHe called the multitude to himself with his disciples and said to them, “Whoever wants to come after me, let him deny himself, and take up his cross, and follow me.
This idea is dealt with by Paul in the above referenced passages.
It's also why it's so important to guard our hearts with all diligence.
It's too easy to slip into the flesh, without even realizing it.