You will have to explain God’s unfulfilled promises to Israel and His broken covenant with Abraham and David, to hold to your claim... Let alone the promise about Israel in the Romans passage.
It is not a broken covenant - it is a fulfilled covenant! Jesus completed the full letter of the law, and left us blameless to the demands of the law. The law could never make us free, only bound to sin. In Jesus we are free indeed! Free of the law, and free of the Old Covenant - Jew and Gentile alike - there is no difference. We now find ourselves - like Adam and Eve before they sinned - fully blameless and in full restoration with God! We can now walk with Him in the cool of the evening - not naked, but clothed in the righteousness of Jesus. Please, do not miss what has been purchased for us at such a great price. The Old Covenant of the Law has been fulfilled and the New Covenant of Grace is in place - there cannot be two “covenants” working at the same time. The old passes away so the new can flourish. Praise God!!!