As a former messianic I know and understand why you believe what you believe. I'd encourage you to read the gospel however. Learn to distinguish between the Old and New covenants. I also know that no amount of scriptural proof will convince you of anything. I put up walls when I was a messianic, as not to allow anyone to take me off what I considered to be the straight and narrow. This post isn't necessarily for you, but to cause those who are being drawn in your direction to really study this out first. I believe it to be very dangerous.
1.) Jesus came as a JEW and taught to the JEWS. He himself was UNDER THE LAW and had to FULFILL the law perfectly.
2.) Jesus could not teach contrary to the law while he was yet alive. For him to do so would have been sin.
3.) The new testament did not come into effect until Jesus death on the cross. Heb 9:16-18 (read further than that for more context.)
4.) New covenant was made not according to the old. Jer 31:31, Heb 8-10 (Read ALL of Hebrews.)
5.) Law of Moses "done away with", "nailed to cross," "old and ready to wax away." Acts 15:5, 15:24, Col 2:14, Heb 8:13, 2 cor, 3:11 (so many more...Just Read the entire N.T.)
Now often what I see Messianics/Adventists etc. do is categorize Gods law into 3 parts. Ceremonial, Mosaic, and Moral laws. This conveniently gives them the ability to do away with PARTS of the law, while keeping others. I would ask them to provide me with an example out of the O.T. where God separates his laws into categories outside of the body of the law of Moses. Gods law is one law and we can prove this with scripture.
(Heb 8:13) In that he saith, A new covenant, he hath made the FIRST old. Now that which decayeth and waxeth old is ready to vanish away.
So what is this first covenant described by the book of Hebrews as "decaying", "waxing old" and "ready to vanish away"?
(Heb 9:18) Whereupon neither the first testament was dedicated without blood.
(Heb 9:19) For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book, and all the people,
(Heb 9:20) Saying, This is the blood of the testament which God hath enjoined unto you.
Hebrews 9:20 is making reference to Exodus 24:8 which is the confirming of the FIRST Covenant, otherwise known as the "Law of Moses." So what makes up the law of Moses? Just go back to Exodus 20 and read from there all the way up to Exodus 24:9
As you can see. It lumps so called Moral, Mosaic, and Ceremonial laws all together and in no particular order all throughout those chapters, as ALL being part of the First Covenant. Which according to the gospel is now decaying, waxing old and ready to vanish away. The new covenant being made "NOT ACCORDING TO" the old. etc. etc. etc.
Another popular verse among messianic and Adventist groups is.... "For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled."
They often seem to miss the gravity of the word "till" in "till all be fulfilled." Jesus fulfilled the law by living a perfect life according to the law. He died on the cross thus putting into effect the New Covenant. The gospel is SO clear on issues concerning the Old vs New covenants it still amazing me how I fell into that snare and how others continue to fall into it as well. It is often easier to be legalistic than it is to understand things like walking in the spirit, grace, "not I that sin but sin that is in me." "dead to sin." and what it means to NOT BE UNDER THE LAW etc.
Usually after this they begin to ask biased questions such as; "Does that mean thou shalt not kill has no application anymore?" Or "Is it now ok to commit adultery?"
Paul actually answers you in (Rom 6:15)
"What then? shall we sin, because we are not under the law, but under grace? God forbid."
I would encourage you to read all of Romans for the full context.
So how is it we can apply the new covenant vs the old?
(Gal 5:22) But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith,
(Gal 5:23) Meekness, temperance: against such there is no law.
Messianics spend a lot of time rediscovering their Hebrew roots. This usually puts them deep into the pages of the O.T. It is easy to read the O.T. in the present tense in which much of it is written. But let's not forget that we have the gospel of Jesus Christ. The New Covenant made not according to the old. Learn how to deal with that rather than not understanding it and going back under the law.
(Jas 2:8) If ye fulfil the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well:
(Jas 2:9) But if ye have respect to persons, ye commit sin, and are convinced of the law as transgressors.
(Jas 2:10) For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.