There is something wrong with your beliefs if you think Paul was speaking of himself as a sinner after being saved. In Romans 7 Paul speaks of someone in which no good lives in, and the good I want to do I cannot.
How in your wildest of imaginations could you ever get that is about Paul after he was saved?
Because no unsaved person has the desire to do good from the inward person as the saved do.
Rom 7:21 I find then a law, that, when I would do good, evil is present with me.
Rom 7:22
For I delight in the law of God after the inward man:
Rom 7:23 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.
Also--
1Jn 1:7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
The lifestyle required by the Lord that He will cleanse from all sin is that of walking in the light, where the light exposes all hidden imperfection, and brings them to our notice to be laid down at the feet of Jesus who renders mercy and healing of the soul.
Heb 4:12 For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
Heb 4:13 Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto the eyes of him with whom we have to do.
Heb 4:14 Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession.
Heb 4:15 For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.
Heb 4:16 Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.
Rom 7:24 O wretched man that I am! who shall deliver me from the body of this death?
LA