That is an application found in Paul's writing, true, but that is not the context of many of his warning about those who seek to be righteous through the works of the Law.
For example, as you have by promoting, falsely, that one must "keep the Sabbath."
Understand what he says in context, Jason.
There is no controversy that this...
Galatians 3:15-19
King James Version (KJV)
15 Brethren, I speak after the manner of men; Though it be but a man's covenant, yet if it be confirmed, no man disannulleth, or addeth thereto.
16 Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
17 And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.
18 For if the inheritance be of the law, it is no more of promise: but God gave it to Abraham by promise.
19 Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator.
...is speaking about the Covenant of Law, under which the works of the Law were given, and that it was not meant to be an enduring Covenant.
There are numerous warnings for those who would seek to remain under the Law in the New Testament, so in regards to whether we should "stop doing it" or not that is simply Basic Bible, my friend.
We do not nullify the principles that are given in the Law, because the Covenant of Law did not originate the principles it holds. It has always been wrong to disobey the revealed will of God, it has always been wrong to murder, it has always been wrong to lie, etc.
But, understanding what Covenant we are under is very important, and unfortunately it is not an issue that is often discussed in typical Church fellowships.
The Covenants describe the relationship GOd determines between Himself and man, and under the Covenant of Law the relationship was limited to the temporal/physical sphere. Under the New Covenant, Jason, we are introduced to relationship with God that is Eternal and spiritual.
This is precisely what Christ is speaking about when He calls Himself the True Vine. The "Vine" that the disciples would have known He contrasted Himself with was Israel herself, and that is how they were in relationship with God...through that Covenant which was specific to Israel. He is basically saying "From henceforth do not trust in your relationship with God through your heritage, but trust in your relationship with God through me."
And Christ is the Veil by which men enter into the presence of God today.
The Word of God is indeed said to be a cleansing agent, that is true, but, have you considered that even during the Age of Law that Gentiles themselves had the Law written on their hearts?
Romans 2:11-15
King James Version (KJV)
11 For there is no respect of persons with God.
12 For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;
13 (For not the hearers of the law are just before God, but the doers of the law shall be justified.
14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:
15 Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another)
God has always provided revelation of Himself to man from Day Six: the internal witness of God, which every man has, the testimony of Creation, and direct revelation, such as God speaking directly to man (whether audibly or to their hearts), God speaking to man through men (Prophets), and God speaking to men through His (written) Word.
God has, from Genesis to Revelation always shown the same consistent pattern, and no man will stand before Christ and say "...but, I didn't know, you didn't tell me!"
So we must properly place the revelation He provides in its proper context, and again, it is just a basic Bible Principle that the Age of Law was a temporary Era that did not disannul the promises GOd had previously made in regards to the Plan of Redemption that He first spoke of in Genesis 3:15.
God has been consistent in judging men according to their understanding of the revelation provided to them and their response to that revelation. So those in Abel's day are not going to be held accountable for the revelation of Abraham's day, they will not be held accountable for the revelation in Moses' day, and they will not be held accountable for the revelation in this Age.
God is Just, and shows grace to each Age according to the revelation He provided them. What you must do is set aside what men tell you the truth is, and ask God to show you that truth in His Word.
He will do that.
God bless.