I cannot dispute the conclusion of your argument, but I don't believe that the new covenant eradicates the old. 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?
Let me ask you these questions.
You have cited several Bible passages to support your conclusion. Others, including many Bible scholars of international reputations, read the same passages and come to different conclusinons. What makes you right and them wrong?
Would you agree that a possibility exists that two honest Bible scholars may come to different conclusions about this issue?
Have you a revelation from God supporting your conclusion and invalidating theirs?
Do these two different interpretations of Scripture effect the historic creeds of the church?