I admit I've posted some links to wacky stuff, but there are many noahide sites I've linked to that are on legitimate noahide sites (run by noahides themselves) and orthodox jewish sites moderated by rabbis.
It's still boils down to this:
Noahidism is propagating, living by the law, in order to be justified/complete before God, and that totally nullifies Christ's fullfilling of the Law through His atoning death for mankinds's sin.
No man has or was justified under the law.........The law tutored mankind to the sensibilities of his profound finite(helpless) condition before a Holy, sinless, Creator.
Paul, himself, called himself, a Jew of Jews as to following the law, but he himself said that no Jew could fullfill the law, and it only took one infraction of the law, to be condemned.
No more yearly sacrifices to assuage or carry-over the sins of a nation to the next year. It was taken care of in the human body of one Man, Christ, who fullfilled the law, jot, and tittle, without one failing of it.
Abraham's hope wasn't a Noahidic dream, but the fullfilling of his faith that still gave him strength to proceed onward. One day, Abraham's seed would be both Jew and gentile nations.........that were justified, not by works, but by faith.........as Abraham's life was justified. Throughout Abramham's life, God, over and over again reiterated to him that his/Abramham's belief/faith was what allowed God to bestow upon him justification/righteousness. If one looks at Abraham's life it is filled with miserable failings, yet, God didn't view those misgivings as reason to deny justifying him. It was Abraham's reckoning faith towards God, that gave Abraham his "heaven passport", before the Almighty's throne.
Noahidic movements, are just pulling or keeping both Jews, and marginal Christian oriented gentiles into a
works-based system of belief, that was done-away with by Christ's mission on earth. This is just what Paul the Apostle to the gentiles had to fight against in the Church at Galatia.
Judiazers!. "You must do this or that, in order to please God. Be circumcized, observe the Sabath, Don't forget this festival, or that festival, Pentacost, the Pass-over. Paul said that these observances weren't bad, but they also didn't add one bit to one's spiritual condition in respect to God's relationship to them. Eating or refraining from certain foods, may have health benefits, but it is only a tradition. Paul, said that both Gentile and Jewish Christians should respect each other in a way that does not lead the other into sin, via their consciences being hurt. On the other hand, Christians should force other Christians to partake of foods, holidays, observances just because they feel a need to have it in their lives. One may be free to eat a meat that's sacrificed to a pagan idol while another couldn't do it in conscience. Both are right to protect the consciences, yet the meat is neutral in all respect.
That's how it is for the "Law". Jesus came to write the Law on men and women's hearts. Not enforce it's adherence upon mankind. With Christian's who submit to Christ, the Law is not burdensome, but becomes the natural course of life. That's because the Law that's authored by God is part and parcel of the Christ-life/Holy Spirit that now resides in their souls.
Noahidic movement = Is a form of Judiazing. Read Galatians in the New Testament.
It is a step backwards into bondage. Grace is nullified.