Today, among many modern day Gentile Christians there is a teaching that Apostle Paul taught a new law, which was not the same Law that Moses delivered unto the children of Israel from Mount Sinai.  Of a truth, Apostle Paul does not make a distinction between an oral law versus the Law of God, in his writings.

If one will take the time to study the words of Paul using the Strong’s Greek Dictionary, then that one should be able to see that in every place where the word 'Law' is written in Paul’s writings, it is referring unto the Law of God.
Moreover, if one also study the words that are recorded in the book of Acts, which were written from the Apostle Luke, then one will come to see that the Jews were 'Believers', in Jesus:(YaHuWSHuWAh), who were saying unto the gentiles, who congregated to hear the message that Paul spoke, that they must be circumcised and keep the Law.  These Jews, being Believers in the Body of Jesus:(YaHuWSHuWAh) Christ:(MaSHiYCH), were not teaching an oral law.  Further more, Paul knew that what these Jewish Believers were saying was the Truth.

Apostle Paul went unto the other Apostles, who were made Apostles before Paul ever became an Apostle.  The chief Apostles sent back a letter, by Paul’s hands, showing only four commandments that are recorded within the Law, unto the gentiles in Asia minor,  who congregated to hear Paul speak the message of Truth on Every Sabbath Day.

ACT 15:2  When therefore Paul and Barnabas had no small dissension and disputation with them, they determined that Paul and Barnabas, and certain other of them, should go up to Jerusalem unto the Apostles and elders about this question.
ACT 15:3  And being brought on their way by the Church, they passed through Phenice and Samaria, declaring the conversion of the gentiles: and they caused great joy unto all the brethren.
ACT 15:4  And when they were come to Jerusalem, they were received of the Church, and of the Apostles and elders, and they declared all things that God had done with them.

ACT 15:5  But there rose up certain of the sect of the Pharisees 'Which Believed', saying, that it was needful to circumcise them, and to command them to keep the Law of Moses.

Notice up above, “Certain” of the sect of the Pharisees, who “Believed”.

The English word 'Believed', in Strong’s:
G4100   πιστεύω   pisteuō    pist-yoo'-o
From G4102; to have faith (in, upon, or with respect to, a person or thing), that is, credit; by implication to entrust (especially one’s spiritual well being to Christ): - believe (-r), commit (to trust), put in trust with.

The certain sect of the Pharisees had faith. They trusted the words of Jesus:(YaHuWSHuWAh) Christ:(MaSHiYCH).

ACT 15:6  And the Apostles and elders came together for to consider of this matter.
ACT 15:7  And when there had been much disputing, Peter rose up, and said unto them, men and brethren, ye know how that a good while ago God made choice among us, that the gentiles by my mouth should hear the word of the gospel, and believe.

Notice up above, God made choice among us, that the gentiles by my mouth should hear the word of the gospel....

In other words, God has appointed the gentiles to receive the word of the message of Truth, by an Anointed man, who is from the house of Judah.

The word of the message of Truth had to be preached unto the gentiles, first, before they would become a doer of the Law.

Why is this true?

Because the gentiles are without the Law. They must be taught the Law, first.

ACT 15:8  And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us;

Anointed Priests testifies the word of the message of Truth unto the gentiles, who then repents from sin, to become baptised and receive the Holy Spirit, even as God did unto the Apostles of the house of Judah, who believed.

ACT 15:9  And put no difference between us and them, purifying their hearts by faith.

The heart of the gentiles is purified by having a moral conviction to uphold the Law.

ACT 15:10  Now therefore why tempt ye God, to put a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear?

The English word 'yoke', in Strong’s:
G2218    ζυγός    zugos        dzoo-gos'
From the root of ζεύγνυμι zeugnumi (to join, especially by a “yoke”); a coupling, that is, (figuratively) servitude (a law or obligation); also (literally) the beam of the balance (as connecting the scales): - pair of balances, yoke.

What is this yoke?

ALL gentiles are obligated to become circumcised and keep the Law of Moses. This obligation will NOT begin to be performed by unbelieving Gentiles, until Anointed Priests testifies the words of the message of Truth unto them, in order to CONVINCE the gentiles to WANT TO OBEY the Law, and therefore to repent and receive the Holy Spirit, which will influence the mind of the gentiles to have faith.

ACT 15:11  But we believe that through the grace of the Lord Jesus Christ we shall be saved, even as they.

Because of the Holy Spirit influence upon the mind of the gentiles, as well as the Jews, who put their trust in the Master Jesus:(YaHuWSHuWAh) Christ:(MaSHiYCH):  the gentiles and also those of Judah will be saved:(made whole).

ACT 15:12  Then all the multitude kept silence, and gave audience to Barnabas and Paul, declaring what miracles and wonders God had wrought among the gentiles by them.
ACT 15:13  And after they had held their peace, James answered, saying, men and brethren, hearken unto me:
ACT 15:14  Simeon hath declared how God at the first did visit the gentiles, to take out of them a people for his name:(honour, authority, and character).
ACT 15:15  And to this agree the words of the Prophets;  As it is written,
ACT 15:16  After this I will return, and will build again the Tabernacle of David, which is fallen down;  And I will build again the ruins thereof, and I will set it up:
ACT 15:17  That the residue of men might seek after the Lord, and all the gentiles, upon whom my name:(honour, authority, and character) is called:(to urge on, give commandment), saith the Lord, who doeth all these things.

In other words, His honour, authority, and character is proclaimed among the gentiles.

ACT 15:18  Known unto God are all his works from the beginning of the world.
ACT 15:19  Wherefore my sentence is, that we trouble not them, which from among the gentiles are turned to God:
ACT 15:20  But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood.

Why was only four commandments of the Law written in the letter?

ACT 15:21  For:(Because) Moses of old time hath in every city them that preach him, being read in the synagogues every Sabbath day.

The Law of Moses is preach unto the gentiles every Sabbath Day, by an Anointed Teacher, who read it in the synagogues.

Conclusion:

A gentile is one, who is not circumcised.  Therefore, the gentile, who becomes a Believer under an Anointed Teacher of Judah, must be taught the Law.  The gentile must repent from transgressing the Law, and be baptised.  The gentile must receive the Holy Spirit from laying on of the hands.  The gentile must be influenced by the Holy Spirit to have a moral conviction to uphold the Law.  Then eventually the gentile will have a desire to perform the Law, perfectly.

In a process of time, the gentile will perform the Law, perfectly.

In other words: the gentile will have a desire to become circumcised, so that the gentile will be able to keep the Feasts of LORD God.  Then the gentile will be able to partake of the passover lamb:(YaHuWSHuWAh), as required by the Law.  Then the gentile will exist under the Everlasting Covenant, which is renewed with a New Testator.

The New Testator is Jesus:(YaHuWSHuWAh) Christ:(MaSHiYCH), who was sacrificed.  The old testator, which is animal sacrifices, was replaced with an acceptable sacrifice, in the presence of LORD God, for all, who will believe, and then continue serving LORD God, as servants in LORD House of God of Israel, unto their end, in righteousness.

Here is more words of Apostle Paul:

1COR 7:18  Is any man called being circumcised?  'let him not' become uncircumcised.  Is any called in uncircumcision? 'let him not' be circumcised.

The phrase 'let him not', written up above twice, was translated from the Greek word:
G3361    μή     Mē      May
A primary particle of qualified negation (whereas G3756 expresses an absolute denial); (adverbially) not, (conjugationally) lest; also (as interrogitive implying a negative answer [whereas G3756 expects an affirmative one]); whether: - any, but, (that), X forbear, + God forbid, + lack, lest, neither, never, no (X wise in), none, nor, [can-] not, nothing, that not, un [-taken], without. Often used in compounds in substantially the same relations. See also G3362, G3363, G3364, G3372, G3373, G3375, G3378.

The Greek word 'me' does not mean: 'let him not'.  The Greek word 'me' does mean: NOT.

Made clearer:
1COR 7:18  Is any man called being circumcised, NOT uncircumcised?  Is any called in 'uncircumcision', NOT circumcised?

The Greek word 'uncircumcision', written up above, was translated from the Greek word:
G203   ἀκροβυστία    akrobustia      ak-rob-oos-tee'-ah
From G206 and probably a modified form of πόσθη posthē (the penis or male sexual organ); the prepuce; by implication an uncircumcised (that is, gentile, figuratively unregenerate) state or person: - not circumcised, uncircumcised [with G2192], uncircumcision.

A gentile, who is not circumcised, is figuratively an unregenerated person.  An unregenerated person is obstinate, unconverted, and unpersuaded.  A gentile has the prepuce around the head of his penis.

1COR 7:19  Circumcision:(the rite of circumcision) is:(profit) nothing:(no man), and uncircumcision:(the prepuce of the penis) is:(profit) nothing:(no man), but the keeping of the commandments of God.

Therefore what profits a man is the keeping of the commandments of God.

What did God command Abraham to do, concerning his own house?

GEN 17:10  This is my Covenant, which ye shall keep, between me and you and thy seed after thee;  every man child among you shall be circumcised.
GEN 17:11  And ye shall circumcise the flesh of your foreskin;  And it shall be a token of the Covenant betwixt me and you.
GEN 17:12  And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of thy seed.
GEN 17:13  He that is born in thy house, and he that is bought with thy money, must needs be circumcised:  And my Covenant shall be in your flesh for an Everlasting Covenant.
GEN 17:14  And the uncircumcised man child whose flesh of his foreskin is not circumcised,
That soul shall be cut off from his people;  He hath broken my Covenant.

Abraham obeyed these commandments of God.  Abraham kept the commandments of God:

GEN 26:2  And the LORD appeared unto him, and said, go not down into Egypt;  dwell in the land which I shall tell thee of:
GEN 26:3  Sojourn in this land, and I will be with thee, and will bless thee;  For unto thee, and unto thy seed, I will give all these countries, and I will perform the oath which I sware unto Abraham thy father;
GEN 26:4  And I will make thy seed to multiply as the stars of heaven, and will give unto thy seed all these countries;  And in thy seed shall all the nations of the earth be blessed;
GEN 26:5  Because that Abraham obeyed my voice, and kept my charge, 'my commandments', my statutes, and my laws:(TuWRaH).
GEN 26:6  And Isaac dwelt in Gerar:

Back to:
1COR 7:18  Is any 'man' called being circumcised NOT uncircumcised?  Is any called in 'uncircumcision' NOT circumcised?

What kind of 'man' is Apostle Paul referring to up above?

Paul is referring unto A Human Nature Minded man, regardless of he being an uncircumcised gentile man or a circumcised Jewish man.  A Human Nature Minded Jew and gentile will not be able to perform the Law perfectly.  They both must become Spiritually Minded.

A Human Nature Minded man oppose the Law of LORD God.  He will not keep the commandments of God.  The human natured mind has no desire in upholding the Law, perfectly.  The human natured mind is not influenced to live by the Law of ALaHiYM.  An unconverted gentile or Jew cannot teach the Law, whereby salvation will be accomplished.

ROM 8:6  For to be carnally:(human nature) minded is death;  But to be Spiritually minded is life and peace.
ROM 8:7  Because the carnal:(human natured) 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.

Now read:

ROM 3:1  What advantage then hath the Jew?  Or what profit is there of circumcision:(rite of circumcision)?
ROM 3:2  Much every way: chiefly, because that unto them were committed the Oracles of God.

As one can read up above, Paul previously wrote unto the Romans, that the rite of circumcision profit the Jew much every way.

Why is this true?

Because that unto them were committed the Oracles of God.  Oracles are the words spoken from God.  Moses received the words from God.  The word “Oracles” is referring to the written Law.

Therefore, a circumcised Jew, who is circumcised in the flesh, must become circumcised in the heart.  An uncircumcised gentile does not have an advantage over a circumcised Jew.

Why is this true?

Because the uncircumcised gentile must become circumcised in the heart, so that he will choose to keep the commandments of God, and therefore, become circumcised in the flesh, as commanded in the Law.

Today, we live in a time of the gentiles.  An uncircumcised gentile is an unregenerated person, who has not the knowledge of the Law.  In The End Time Days, known as the last seven years of The Last Days, the Sons of Zadok, the Anointed Priests of the Two Cherubs, who are prophesied of, by the ancient Prophets mouths, will be able to teach the Law unto those, who will seek for it.

Now, look at Galatians:

GAL 5:1  Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage.
GAL 5:2  Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.

Paul was speaking unto the gentiles, who had gather unto him to hear his message.  These gentiles were not yet fully converted unto the keeping of the Law.  These gentiles had to be persuaded, to want to observe and then do the Law, by the Ordained Teacher, namely the Apostle.

GAL 5:3  For I testify again to every man that is circumcised, that he is a debtor to do the whole Law.

Apostle Paul is referring unto A Human Nature Minded man that is circumcised.

GAL 5:4  Christ is become of no effect unto you, whosoever of you are justified by the Law;  ye are fallen from grace.

A person, who is human nature minded, will not be sanctified by the Law, because that same person is not able to perform the Law, perfectly.  Those, who are in Jesus:(YaHuWSHuWAh) Christ:(MaSHiYCH), will be influenced by the Holy Spirit to have a moral conviction to uphold the Law, perfectly.  They will be sanctified by righteousness of the Law.

GAL 5:5  For we through the Spirit wait for the hope of righteousness by faith.

GAL 5:6  For in Jesus Christ neither circumcision 'availeth' any thing, nor uncircumcision;  But faith which worketh by love.

Definition of the word 'availeth' in Strong’s Greek Dictionary:
G2480   ἰσχύω    ischuō    is-khoo'-o
From G2479; to have (or exercise) force (literally or figuratively): - beable, avail, can do ([-not]), could, be good, might, prevail, be of strength, be whole, + much work.

G2479   ἰσχύς   ischus    is-khoos'
From a derivative of ἱς his (force; compare ἔσχον eschon; a form of G2192); forcefulness (literally or figuratively): - ability, might ([-ily]), power, strength.

Forcing the rite of circumcision upon a person, who is being called into the Body of Jesus:(YaHuWSHuWAh) Christ:(MaSHiYCH), will not benefit that person.  A gentile person, who chooses to become a servant within the LORD's House of God of Jacob, must be taught the Law by an Anointed Teacher of the Law.  Eventually, that same gentile person will be persuaded by the Holy Spirit to have faith:(a moral conviction to uphold the Law).  By a process of time, while being taught the message of Truth, the gentile person will have a desire to Observe to Do ALL, of the Commandments of the Law, In the Presence of LORD God, as commanded.

Uncircumcision is not profitable unto a man who is a servant in LORD House of God.  An uncircumcised man will not ever be able to eat the passover lamb, and then keep the Feast, as required by the Law.

A person, having a moral conviction to perform the commandments of the Law, profits very much.

Love is the keeping of the commandments:

1JN 2:3  And hereby we do know that we know him, if we keep his commandments.
1JN 2:4  He that saith, I know him, and keepeth not his commandments, is a liar, and the Truth is not in him.
1JN 2:5  But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.
1JN 2:6  He that saith he abideth in him ought himself also so to walk, even as he walked.

Read:
GAL 5:12  I would they were even 'cut off' which trouble you.

In GAL 5: 12,  Paul does NOT refer unto the whole penis being cut off.  Some people falsely teach:  "They should just cut their whole thing off."

Paul would that they were not present around those seeking the Truth, for they were teaching a different message.

One, who will observe and then do the Law, will not ever desire, that a man's whole penis be cut off.

To understand why Believers of the Spiritual Body of Christ Must be reconciled with one another before LORD God will accept them in the Eternal Kingdom, click on this Link:  Believers of the Spiritual Body of Christ Must Be Reconciled With One Another Before LORD God Will Accept Them In the Eternal Kingdom