The second possible objection that could be raised to what Paul said in chapter 2 is that perhaps God is unfaithful if indeed members of His Old Covenant people can be lost.
We see instead that God is Truth itself and that He will inevitably be vindicated on the Day of Judgment and every man will be found to be a liar. It cannot be that God would ever be unfaithful. He never promised to save all the Jews, but rather to save all those who believe. He has been unswervingly faithful to that promise, and always will be.
We meditate on the faithfulness of God and what a comfort this is to the believer - but also that His faithfulness means He will perform all He has threatened to those who reject Him and refuse to believe the Truth.