Paul wasn't God; he was a mere man. So why would anyone believe he had the right to suggest YHWH's Divine Instructions (Torah - Genesis through Deuteronomy) or Y'shua's teachings were negated in any way, just because Y'shua sacrificed himself on our behalf?
Truth is - Paul DIDN'T do that - ever! The Bible, when read in context, amply reveals that fact. The problem was that Paul was attempting to translate difficult Hebrew concepts into Greek, the Bible translators ran with what they THOUGHT he meant - and then basically skewed those scriptures to match what they thought.
Greek translations that present a supposedly Torah-less Messiah who came to abolish all of his Father's Divine Instructions and teach that after his death, man would have no other obligation to God besides "believing in Jesus" - and that the entire "Old Testament" pertained only to the Jews ... with the exception of the tithing thing, of course...
Over and over again, throughout the Torah, we see YHWH saying in various ways: "Be holy because I am holy.".
And how does one know how to "be holy"? It was revealed to us in Leviticus 18:
Leviticus 18: 1 ADONAI said to Moshe, 2 "Speak to the people of Isra'el; tell them, 'I am ADONAI your God. 3 You are not to engage in the activities found in the land of Egypt, where you used to live; and you are not to engage in the activities found in the land of Kena'an, where I am bringing you; nor are you to live by their laws. 4 You are to obey my rulings and laws and live accordingly; I am ADONAI your God. 5 You are to observe my laws and rulings; if a person does them, he will have life through them; I am ADONAI. (CJB)
And here we see that His Torah pertained to ALL who chose Him to be their God:
Numbers 15: 13 "'Every citizen is to do these things in this way when presenting an offering made by fire as a fragrant aroma for ADONAI. 14 If a foreigner stays with you - or whoever may be with you, through all your generations - and he wants to bring an offering made by fire as a fragrant aroma for ADONAI, he is to do the same as you.
15 For this community there will be the same law for you as for the foreigner living with you; this is a permanent regulation through all your generations; the foreigner is to be treated the same way before ADONAI as yourselves. 16 The same Torah and standard of judgment will apply to both you and the foreigner living with you.'" (CJB)
Isaiah 56: 6 And foreigners who bind themselves to YHWH to serve him, to love the name of YHWH, and to worship him, all who keep the Sabbath without desecrating it and who hold fast to my covenant 7 these I will bring to my holy mountain and give them joy in my house of prayer. Their burnt offerings and sacrifices will be accepted on my altar; for my house will be called a house of prayer for all nations." (CJB)
And here we see it reiterated in the New Testament:
1 Timothy 6: 3 If anyone teaches differently and does not agree to the sound precepts of our Lord Yeshua the Messiah and to the doctrine that is in keeping with godliness, 4 he is swollen with conceit and understands nothing. Instead, he has a morbid desire for controversies and word-battles, out of which come jealousy, dissension, insults, evil suspicions, 5 and constant wrangling among people whose minds no longer function properly and who have been deprived of the truth, so that they imagine that religion is a road to riches. (CJB)
Were the passages above for "the Jews" only? NO! There were no "Jews" until Jacob had a son named Yehudah (Judah) who "became" the Tribe of Judah, where the term "Jew" originated - yet up to that time, ALL who believed in the God of Abraham, Isaac and Jacob were Torah observant.
As "grafted in to the Olive Tree" today's Gentile believers are part of Israel, and therefore, obligated to OBEY God just the same as "the Jews." Same God, same rules. See Numbers 15:13-16, which Paul reiterated:
Romans 10: 12. And in this, it discriminates neither Jews nor Gentiles. For there is one, Master YHWH, over them all, who is abundantly generous towards every one that calls on him. 13. For everyone that will call on the name of Master YHWH, will have life. (AENT)
The bottom line is:
If you aren't obeying YHWH's Divine Instructions, then WHOM are you worshiping? By ignoring the things we are still able to keep today (Seventh Day Sabbath, seven Feasts/Appointed Times (all of which foreshadow Y'shua) and eating only "clean" meats) you'll risk being considered "lukewarm" on the day of Y'shua's return (Revelation 3:16).