A Christian is forgiven of their sins. We remain in a corrupted flesh body until we are raised up and with one that is glorified and incorruptible.
edit* I think it's important to separate your spiritual body from your physical body, concerning sin. A Christian is washed of all their sin, because you are washed of sin does not mean you will stop sinning. We are renewed from the inward out. We remain in a corrupted flesh body; this is apart from the spiritual body, which is cleansed. Yes, all sin becomes loathsome to a Christian. Yes, we live our life in a way that is pleasing to God. Yes, we turn from our old sinful ways. The fact remains that we are being perfected; we are not perfect. We will not be perfect until God brings us home to Him and corruption puts on in-corruption. I believe a believer's salvation is eternally secure. I believe a Christian is forgiven of past, present, and future sin.
Even Paul struggled with sin...
Romans 7:14-25
For we know that the law is spiritual, but I am carnal, sold under sin. For what I am doing, I do not understand. For what I will to do, that I do not practice; but what I hate, that I do. If, then, I do what I will not to do, I agree with the law that it is good. But now, it is no longer I who do it, but sin that dwells in me. For I know that in me (that is, in my flesh) nothing good dwells; for to will is present with me, but how to perform what is good I do not find. For the good that I will to do, I do not do; but the evil I will not to do, that I practice. Now if I do what I will not to do, it is no longer I who do it, but sin that dwells in me. I find then a law, that evil is present with me, the one who wills to do good. For I delight in the law of God according to the inward man. But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members. O wretched man that I am! Who will deliver me from this body of death? I thank God--through Jesus Christ our Lord! So then, with the mind I myself serve the law of God, but with the flesh the law of sin.