True until they turned to the Gentiles, and Saul/Paul was appointed the Apostle to the Gentiles. He always went to the Jew first. He also went to the Greeks/Gentiles. Your desire that all nonJewish believes be secret descendants of so-called lost tribes of the Northern Kingdom separated after Solomon, is not taught in the Scripture, not part of Apostolic / Early Church traditions that we received, and was certainly adopted by Mormons, British Israel followers, and others who feel making themselves Jewish will bring them closer to God (which is false). If you were born to Jewish parents and believe on Yeshua, be at liberty to keep any law or tradition you can that does not conflict with the entire Canon. If you were born a Gentile, remain a Gentile and feel free to do the same but do not cast a stumbling block before Jew or Gentile; beware of cults and heresies, and those who deceive for money
Good to see another mature post. Been lacking a bit here.