Certainly not! God’s Word can never be broken. It is totally reliable, and its integrity is beyond question. The promises made to Israel will be honoured. But there is a vital point to grasp. True Israel and earthly Israel are not the same thing. Not every member of earthly Israel is a member of God’s Israel. This is the key which unlocks these three chapters. All that Paul is trying to prove is summarized in the second half of verse 6: not every one who is descended from Israel is a member of Israel.
Page 114