I both agree and disagree with you. You say that if we abide in Him then we cannot sin, and I say that this is true in a way. I say that sin will still be a part of our lives while we live here on Earth and yet we will still abide in Him. Look at what Paul says in Romans 7:15-24

15. For what I am doing, I do not understand; for I am not practicing what I would like to do, but I am doing the very thing I hate.
16. But if I do the very thing I do not want to do, I agree with the Law, confessing that the Law is good.
17. So now, no longer am I the one doing it, but sin which dwells in me.
18. For I know that nothing good dwells in me, that is, in my flesh; for the willing is present in me, but the doing of the good is not.
19. For the good that I want, I do not do, but I practice the very evil that I do not want.
20. But if I am doing the very thing I do not want, I am no longer the one doing it, but sin which dwells in me.
21. I find then the principle that evil is present in me, the one who wants to do good.
22. For I joyfully concur with the law of God in the inner man,
23. but I see a different law in the members of my body, waging war against the law of my mind and making me a prisoner of the law of sin which is in my members.
24. Wretched man that I am! Who will set me free from the body of this death?

What Paul is saying here is that we have two people dwelling within us, the old man or the flesh, and the new man; the one who is reborn into the image of Christ. The old man knows nothing but sin and cannot please God even if he tried with all his might. The other guy is the one who delights in doing God's will and he is the one that God see's when he looks at us. Look at the question that Paul asks in verse 24. "Who will set me free from the body of this death" He goes on to answer his own question in verse 25 and then in chapter 8:

25. Thanks be to God through Jesus Christ our Lord! So then, on the one hand I myself with my mind am serving the law of God, but on the other, with my flesh the law of sin.
Romans 8
1. Therefore there is now no condemnation for those who are in Christ Jesus.
2. For the law of the Spirit of life in Christ Jesus has set you free from the law of sin and of death.
3. For what the Law could not do, weak as it was through the flesh, God did: sending His own Son in the likeness of sinful flesh and as an offering for sin, He condemned sin in the flesh,
4. so that the requirement of the Law might be fulfilled in us, who do not walk according to the flesh but according to the Spirit.

Now I know it is tempting to say that in order for us to walk according to the Spirit we must never, ever sin again, but I don't think that is what Paul is talking about here. I think what he is saying is that while our "mind" (or new man, saved man) is serving God, the old man will still go on doing it's own thing. It will always want to serve the law of sin and death and there really isn't anything we can do about that. We can, and must, strive to become more and more the new man that is reborn in God's image, but in this lifetime we will never be completely free from the old man of the flesh. However, we do not have to live with the old man of the flesh as our master any more. We know that we are not condemned by God if we are in Christ Jesus and that the only person He see's when he looks at us is the new person. Look at Romans 8:5-17:

5. For those who are according to the flesh set their minds on the things of the flesh, but those who are according to the Spirit, the things of the Spirit.
6. For the mind set on the flesh is death, but the mind set on the Spirit is life and peace,
7. because the mind set on the flesh is hostile toward God; for it does not subject itself to the law of God, for it is not even able to do so,
8. and those who are in the flesh cannot please God.
9. However, you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. But if anyone does not have the Spirit of Christ, he does not belong to Him.
10. If Christ is in you, though the body is dead because of sin, yet the spirit is alive because of righteousness.
11. But if the Spirit of Him who raised Jesus from the dead dwells in you, He who raised Christ Jesus from the dead will also give life to your mortal bodies through His Spirit who dwells in you.
12. So then, brethren, we are under obligation, not to the flesh, to live according to the flesh--
13. for if you are living according to the flesh, you must die; but if by the Spirit you are putting to death the deeds of the body, you will live.
14. For all who are being led by the Spirit of God, these are sons of God.
15. For you have not received a spirit of slavery leading to fear again, but you have received a spirit of adoption as sons by which we cry out, "Abba! Father!"
16. The Spirit Himself testifies with our spirit that we are children of God,
17. and if children, heirs also, heirs of God and fellow heirs with Christ, if indeed we suffer with Him so that we may also be glorified with Him.

When we accept Jesus as our Lord and Savior, we are trully reborn into a completely new person. Although the old person still lives as well, our new person is the one who is trully alive through the Holy Spirit because it is that person who is constantly being led by His Spirit. And although the old man will sometimes win out and mannage to sin from time to time, we who are led by the Spirit of God are no longer under any obligation to be slaves to that sin, but can go boldly into His presence and confess what we have done, knowing that he will always lovingly forgive us. Because we are children of God, heirs with Christ. True heirs of God cannot be slaves of anything any more. We have inherited so much through Jesus Christ that after a while (I believe) no sinful thing or wordly thing can ever compare to that which we have recieved.

31. What then shall we say to these things? If God is for us, who is against us?
32. He who did not spare His own Son, but delivered Him over for us all, how will He not also with Him freely give us all things?
33. Who will bring a charge against God's elect? God is the one who justifies;
34. who is the one who condemns? Christ Jesus is He who died, yes, rather who was raised, who is at the right hand of God, who also intercedes for us.
35. Who will separate us from the love of Christ? Will tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword?
36. Just as it is written, "FOR YOUR SAKE WE ARE BEING PUT TO DEATH ALL DAY LONG;
WE WERE CONSIDERED AS SHEEP TO BE SLAUGHTERED."
37. But in all these things we overwhelmingly conquer through Him who loved us.
38. For I am convinced that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers,
39. nor height, nor depth, nor any other created thing, will be able to separate us from the love of God, which is in Christ Jesus our Lord.

I do not believe we can ever be completely free from sin in this lifetime and yet, through Christ we are already free from it. We have been freed from it's power over us and over our lives. Condemnation by the law has been replaced by forgiveness and a loving inheritance through Jesus Christ. Do we live sinless lives right away? No, but because of the work of the Holy Spirit, we are constantly being transformed more and more into the image of our Father. We are becoming more and more like Christ. When will we ever be able to live sinless lives? I don't know, but I'm sure it cannot be in this lifetime. I would challenge anyone to show me one person besides Jesus who has been able to achieve such a thing.

In Christ's Love,
Chris