Just a quick reply as I'm short of time right now.
Above you seem to say that anyone who does not obey the law completely is separated from God, being slaves to sin and are condemned by the law, being not free and thus not saints.
So, for example, any Christian who does not obey the Sabbath is therefore separated from God, a slave to sin and condemned by the law and therefore not a saint.
You also allege that anyone who repents but does the same offence over and over again, has not really repented and is thus separated from God, a slave to sin, condemned by the law and not a saint. So you claim that God does not forgive 7x70 as He asks us to do.
Am I understanding you correctly?
Yes if you sin then you show that you are a slave to sin as it is written:
Joh 8:34 Jesus answered them, Verily, verily, I say unto you, Whosoever committeth sin is the servant of sin.
are these not the words of Jesus?
Does the law show sin?
Rom 7:7 What shall we say then? Is the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet.
and again:
Rom 7:12 Wherefore the law is holy, and the commandment holy, and just, and good.
Rom 7:13 Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.
So the law is not sin but it points out sin and because we have all sinned it condemns us to death as it is written:
Rom 7:10 And the commandment, which was ordained to life, I found to be unto death.
and again:
Joh 8:34 Jesus answered them, Verily, verily, I say unto you, Whosoever committeth sin is the servant of sin.
So yes those who sin are slaves to sin and are thus not free. as it is written of the natural nature of man:
Rom 7:14 For we know that the law is spiritual: but I am carnal, sold under sin.
notice that this person is sold under sin that is a slave to sin and not free, and thus unable to keep Gods law, so rightly one will cry:
Rom 7:24 O wretched man that I am! who shall deliver me from the body of this death?
Does not the law lead us unto Christ?
You use the example of the Sabbath and that is good because that is indeed part of Gods 10 commandments and yes Just as with the other nine it is sin to deny Gods Holy Day which He made for all mankind and He blessed and He Set apart as Holy.
As to Repentance You have not understood my correctly thank you for asking.
Forgiveness is always offered to the one who Repents/turns from their sin. but notice the text:
Mat 18:21 Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times?
Mat 18:22 Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.
its an assumption that the sin is the same sin over and over again. however lets say a person does keep doing the same sin over and over again, Has that person turned/repented?
If I punch you in the face and then say, "please forgive me" and you do then I straight away punch you in the face and proceed to ask for your forgiveness, will you continue to forgive? maybe so but have I repented/turned from punching you in the face? no.
So it is with those who are born again, they no longer do those things that end in death because they have the Spirit of God and the spirit is contrary to the flesh 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.
Gal 5:18 But if ye be led of the Spirit, ye are not under the law.
Gal 5:19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
Gal 5:20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
Gal 5:21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
notice that they are contrary to one another, now if you do those things listed as works of the flesh are you not carnal?
can bad grapes come from a good tree? can salty water flow from a pure fresh spring? no.
so then if you murder or envy, or get into fight etc are you not carnal. as it is written:
Gal 5:16 This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.
You can not be led by the Spirit and do the works of the flesh.
Gal 5:22 But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith,
Gal 5:23 Meekness, temperance: against such there is no law.
notice that only those who are led by the spirit are not under law. and those who are led by the spirit do not do the works of the flesh so then those who are led by the Spirit must obey the law thus the law is not against them.
This is not the work of man but he work of God only possible by Faith in His promises. as it is written:
Hab 2:4 Behold, his soul which is lifted up is not upright in him: but the just shall live by his faith.
I believe in the power of the blood and life of Jesus to free all who will trust in His promises.
hope that helps.