Well then, in what way is the old covenant still in effect? How would you go about proving your views from the Bible, esp. in light of all the NT says about the true children of Abraham being the members of CHrist's body, the Church?
"In that He says, 'A new covenant,' He has made the first obsolete. Now what is becoming obsolete and growing old is ready to vanish away." (Heb. 8:13)
That was written 2000 years ago. What parts of the old covenant were not "obsolete" and fading away back then?