The New Covenant is having the Torah written on our HEARTS, as you will see if you read Jeremiah 31, Hebrews chapters 8 & 10. The same laws (or more accurately "teachings") are written on our hearts by Yahshua's Spirit, enabling us to LOVE them. This is what happened for the first time at "Pentecost" (Shabuoth). This is now our “circumcision”, and it is pictured by our immersion in water (Col. 2:11,12). He said, "If you love Me, keep (observe, obey) My Commandments". When we are convicted of our sinfulness, we are to repent of our sins, and obey. The Torah (10 Commandments) DEFINE what is a sin, 1 John 3:4. Please read 1 John 3:22-24, and see if anything harmonizes with what we're discussing here.
Yahweh's Covenant is clearly for any "foreigner" who joins themselves to Israel -- see Isaiah / (Yesha Yahu) 56. There is no covenant in Scripture with any people but Israel, and Israel is 12 tribes, not only “Jews” (Yahudim). Israel is Yahweh’s wife (or bride). Those observant of Shabbat / Sabbath will be brought to His set-apart mountain, and be among His people (see Is. 56, and 66). Actually, the Sabbath is the "test", to see whether, or not, we will obey His Commandments! (see Exodus 16:4). Reading Acts, you will see “Sabbath” often—and this is not “Sun-day”. The act of resting on Shabbat is the “sign” of the eternal Covenant, and it commemorates CREATION, and shows Yahwehs you are His and acknowledge Him as Creator. Try to find in Scripture where "legalism" (according to Torah, not human traditions) is ever a problem for anyone's salvation. Human "legalism" is rampant -- look at "Sun-day", Easter, Christmas, and so on. Easter is Ishtar, the Earth Mother; Christmas was originally the birth of the SUN, and is therefore Satan’s birthday. These things are invented by men, and are not found anywhere in Scripture. If you don't observe them, you're considered strange. They are men's laws, or legalism. It's lawlessness, the ignoring of the Torah (walking in darkness), that will condemn us, and this is what Satan has been so successful in promoting.
You could begin by reading James 1:23, and the entire chapter 2, where "faith" is perfected by "works". We show our faith by our obedience. This is not in conflict with Ephesians 2, because the "gift" is our faith, which enables us to do good works, such as observe the Torah (Eph. 2:10). The unconverted human who is still in the "mind of the flesh" interprets the Scriptures seeking out lawlessness from the dark point of view, and will not submit to the Torah of Yahweh, nor can it do so. But, the mind of the Spirit enables us to obey, because we AGREE with the Torah, and love it. I love the Commandments of Yahweh, and teach them. Yahshua told us that whosoever keeps and teaches them will be called great in the Kingdom, but whosoever annuls the least of them will be the least. Romans chapters 6 through 8 will explain the New Covenant to you. The 3 apostles who were “supports” (Gal. 2:9) were James, Peter, and John (their real names were Ya’akob, Kepha, and Yahuchanon). Their letters should have followed Acts, since they are foundational. Paul’s letters refine details, and can easily confuse those who are not well-grounded and taught correctly, as Kepha warned us at 2 Pet.3:15-17 (He said the untaught distort the meaning of Paul’s letters, and become lawless).
The denominations each have their "seminaries" to train young ministers according to their pattern, or LIST OF EXCUSES for NOT OBEYING. How is this any different than what Cain did when he offered vegetables to Yahweh, when Yahweh did not ask for such an offering? Each denomination has their own peculiar list of excuses, and when these excuses are learned well enough by the seminary student, then they are granted their "ordination" to speak for the denomination. When you enter into the New Covenant fully, you will hear ANTI-MESSIAH each time you listen to such men. Seeing with eyes filled with LIGHT (Torah), you will be enabled to LOVE the Torah, and LOVE obeying. Your ears will be opened.
Yahshua is near, ask Him to reveal the Truth to you -- and write His perfect Torah on your heart. Then, you will begin an incredible task He has prepared just for you to go and teach others all He has commanded, and immerse them into His Name, Yahshua. You will see your teachers (the Commandments), and hear a voice behind you, saying "This is the way, walk in it". You will love obeying. Your obedience is your way of showing Yahweh that you love Him, and is evidence of your being saved, and evidence of your faith. That's being "FAITHFUL" to Yahweh, our Husband. He refers to disobedience and syncretism (mixing) as "harlotry". We can't make up our worship - that's what Cain did.
The congregation of Israel has been re-named by men. They now call it "the Church". To get rid of the Commandments, especially that "Jewish" Commandment called "the Sabbath", they had to get rid of "Israel", and pretend "the Church" is now "spiritual Israel". The problem? There's no Scripture to back it up. We who have been awakened and have overcome by the blood of Yahshua know that the lies are predicated on "replacement theology". They believe they have "replaced" Israel, and no longer have to obey the Covenant -- the Everlasting Covenant -- made with Israel. The TRUE Israel of YaHweh is the wife/bride of Yahshua, and they "keep the Commandments", and will be able to enter into the gates of the city (New Yerushaliyim). Outside will be those who do not obey, called the dogs. There are only two "denominations": dogs, and Israelites, the children of YaHweh who love and obey Him.