Hi to both of you,
 
I only make it to 5 doves occasionally these days and recently I have watched you both debated the ability of a true christian to sin.  Needless to say I have been pondering the use of the scriptures you have both been using.  Isn't it great to have to defend your beliefs?  It causes you to run to the word and seek God for not only wisdom but understanding.  Mind if I weigh in?
 
I popped on my radio during break time one day last week at work.  Something that was said about the scriptures of 1 John caught my attention and I made a point of looking up those scriptures when I got home from work.  All of a sudden, I was plopped right into the middle of your debate.  I know that I am a firmly established believer and yet I KNOW I sin.  But 1 John 3 was causing a lot of havoc with the idea that it was possible.  Fortunately 1 John 2:27 states:
 
   But the anointing which ye have received of him abideth in you, and ye need not that any man teach you; but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him.
 
So knowing that is God's anointing and purpose in my life is to teach me about Him,  I asked for His guidance and tried to make headway though some verses in 1 John 3
 
6  Whosoever abideth in him sinneth not'; whosoever sinneth hath not seen him, neither known him.
 
7  Little children, let no man deceive you' he that doeth righteousness is righteous, even as he is righteous.
 
8  He that committeth sin is of the devil; for the devil sinneth from the beginning.  For this purpose the Son of God was manifested, that he might destroy the works of the devil.
 
9  Whosoever is born of God doth not commit sin for his seed remaineth in him, and he cannot sin, because he is born of God.
 
Now if those weren't words to chew on.  So.....I went to the next best thing to pondering and started a discussion with my new husband.  He is so great.....he isn't threatened by my ponderings and that is what I was doing.  I wondered, since I am saved and I KNOW I sin, what was wrong with the picture that was coming to my mind over these verses.  Then I thought, could these verses be stating that that which the father has given birth to within me (spiritual salvation), that spirit could not sin.  And yet the old sin nature of my soul which was not reborn during my spiritual salvation experience, can still be subject to sin.  If I sin, then it is not the new life that is sinning, it is the old nature that still resides in me.  My husband then reminded me of the scripture where Paul states that those things which he would do, he does not...and those things he would not want to do, he finds himself doing.  And yet he states it was not him, but the sin that resided in him that did those things.  Even Paul recognized that he sinned, but since he was a new creation and willingly living his life in that new realm, he was still subject to the things of the flesh until they slowly passed away by the washing of the word and through the power of healing that comes through fellowship with the father.
 
I had an "a hah" moment.  So in a sense you are both right.  Greg, you are right in that your new nature cannot sin.  Amy you are also correct in that all christians will sin because we are yet bound to this body of death.  That is why our great hope of redemption of both the body and the soul are yet future and provide a great incentive for us in living a full christian life.