I am afraid you are backing yourself into a corner here.
you said you sin and so do you. Well aside form the fact that you don't know me so you have no right to make that claim. you do admit you sin and then quote Romans 7 to support you which means you actually think its normal or ok to be like this in Christ.
However it is you that does not understand this text so I will help you by pointing out some things you may have missed.
lets start at the beginning:
Rom 7:14 For we know that the law is spiritual: but I am carnal, sold under sin.
So you accept the law is spiritual, and then confess that you are carnal still and are still sold under sin making you a slave to sin.
So you claim that you are not spiritual but carnal. is this the case?
IF not then why are you using these verses to substantiate your position?
what about this verse:
Rom 7:24 O wretched man that I am! who shall deliver me from the body of this death?
This is in direct relation to the verses you just quoted so you also admit that you are not delivered and are headed to death.
You admit that you want to do good but can't cause you are a slave to sin. but you can be free in Christ.
So you claim to be carnal and not spiritual, you claim to be a slave to sin and you claim to be undelivered from death.
Rom 8:6 For to be carnally minded is death; but to be spiritually minded is life and peace.
you claim to be carnal.
and you claim the experience of the carnal mind:
Rom 8:7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
Rom 8:8 So then they that are in the flesh cannot please God.
you are not subject to the law of God and thus though you will to do good you can not do it.
but My God not only give us the will but the ability to do.
can the Romans 7 man do what He wills?
Rom 7:18 For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not.
But God says:
Php 2:13 For it is God which worketh in you both to will and to do of his good pleasure.
So God works to will and to do, so you confess that God is not working in you to do his good pleasure but only will.
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.
you confess that you delight in the law of God in the inward man but you are a slave to the law of sin. thus you are carnal and not spiritual.
but those who are spiritual it says:
Eph 3:16 That he would grant you, according to the riches of his glory, to be strengthened with might by his Spirit in the inner man;
Eph 3:17 That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love,
Eph 3:18 May be able to comprehend with all saints what is the breadth, and length, and depth, and height;
Eph 3:19 And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God.
We are strengthened in the inner man by the Spirit. no longer captive to the law of sin.
and again:
Rom 8:1 There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
Rom 8:2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
Those of us who are in Christ no longer walk according to the flesh which you admit walking according to. we by the Spirit in Christ are fee form the law of sin and death which you confess you are captive to the law of sin.
notice also:
Rom 7:15 For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.
classic slave to sin as it is written:
Gal 5:17 For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would.
your flesh lusts against the spirit and you cannot do the things you want to do. but we who walk in the spirit:
Gal 5:16 This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.
are free from such things.
think carefully friend.