The foundation of Christianity is the apostles and the prophets, therefore as you posted in order to understand the idioms used in Matthew, Mark, and Luke one must first understand Hebrew culture and approach the OT and portions of the NT with a Hebrew mindset. However, your take that Christianity is nothing more than a sect of Judaism and we must adhere to the Torah denies Biblical truth.

The Jews were and remain God's chosen people and the Law was given to the sons of Israel, not to gentiles.

The Lord called Paul to be the apostle to the Jews and the gentiles:

Galatians 3:21-25

21 Is the law then against the promises of God? Certainly not! For if there had been a law given which could have given life, truly righteousness would have been by the law. 22 But the Scripture has confined all under sin, that the promise by faith in Jesus Christ might be given to those who believe. 23 But before faith came, we were kept under guard by the law, kept for the faith which would afterward be revealed. 24 Therefore the law was our tutor to bring us to Christ, that we might be justified by faith. 25 But after faith has come, we are no longer under a tutor.
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Galatians 3:26-4:11

For you are all sons of God through faith in Christ Jesus. 27 For as many of you as were baptized into Christ have put on Christ. 28 There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus. 29 And if you are Christ's, then you are Abraham's seed, and heirs according to the promise.

4:1 Now I say that the heir, as long as he is a child, does not differ at all from a slave, though he is master of all, 2 but is under guardians and stewards until the time appointed by the father. 3 Even so we, when we were children, were in bondage under the elements of the world. 4 But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law, 5 to redeem those who were under the law, that we might receive the adoption as sons.

6 And because you are sons, God has sent forth the Spirit of His Son into your hearts, crying out, "Abba, Father!" 7 Therefore you are no longer a slave but a son, and if a son, then an heir of God through Christ.

8 But then, indeed, when you did not know God, you served those which by nature are not gods. 9 But now after you have known God, or rather are known by God, how is it that you turn again to the weak and beggarly elements, to which you desire again to be in bondage? 10 You observe days and months and seasons and years. 11 I am afraid for you, lest I have labored for you in vain.
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Hebrews 7:11-19

Therefore, if perfection were through the Levitical priesthood (for under it the people received the law), what further need was there that another priest should rise according to the order of Melchizedek, and not be called according to the order of Aaron? 12 For the priesthood being changed, of necessity there is also a change of the law. 13 For He of whom these things are spoken belongs to another tribe, from which no man has officiated at the altar.

14 For it is evident that our Lord arose from Judah, of which tribe Moses spoke nothing concerning priesthood. 15 And it is yet far more evident if, in the likeness of Melchizedek, there arises another priest 16 who has come, not according to the law of a fleshly commandment, but according to the power of an endless life. 17 For He testifies:
"You are a priest forever
According to the order of Melchizedek."

18 For on the one hand there is an annulling of the former commandment because of its weakness and unprofitableness, 19 for the law made nothing perfect; on the other hand, there is the bringing in of a better hope, through which we draw near to God.
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Acts 15:22-29

Then it pleased the apostles and elders, with the whole church, to send chosen men of their own company to Antioch with Paul and Barnabas, namely, Judas who was also named Barsabas, and Silas, leading men among the brethren.

23 They wrote this, letter by them:

The apostles, the elders, and the brethren,

To the brethren who are of the Gentiles in Antioch, Syria, and Cilicia:

Greetings.

24 Since we have heard that some who went out from us have troubled you with words, unsettling your souls, saying, "You must be circumcised and keep the law" -- to whom we gave no such commandment -- 25 it seemed good to us, being assembled with one accord, to send chosen men to you with our beloved Barnabas and Paul, 26 men who have risked their lives for the name of our Lord Jesus Christ. 27 We have therefore sent Judas and Silas, who will also report the same things by word of mouth. 28 For it seemed good to the Holy Spirit, and to us, to lay upon you no greater burden than these necessary things: 29 that you abstain from things offered to idols, from blood, from things strangled, and from sexual immorality. If you keep yourselves from these, you will do well.

Farewell.

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