Sure....it's probable that many folks (remote tribes) do not yet have Israelite blood.....or Our Messiah's sacrificial covering as well. This is through no fault of their own and many missionaries throughout history have attempted to rectify this situation.
Not to worry.....Our Lord has a plan to include everyone (upon their own personal acceptance). He will not condemn these folks to eternal separation because some missionary had a flat tire and could not make it in time to some old "Jivaro's" deathbed. [1 Timothy 2:1-4] I exhort therefore, that, first of all, supplications, prayers, intercessions, and giving of thanks, be made for all men; For kings, and for all that are in authority; that we may lead a quiet and peaceable life in all godliness and honesty. For this is good and acceptable in the sight of God our Saviour; Who will have all men to be saved, and to come unto the knowledge of the truth.
Thank you for answering that question, I then apologize as I misunderstood both of you to be some kind of folks promoting a caste system (descended genetically from Abraham and those not). That philosophy is something I abhore, as I’ve said earlier as it negates Christ’s sacrifice.