Thanks to your Romans 9 book and Bob Leitzel's book, I can see the chapter more clearly. Unbelieving Jews are acting like Hebrew idolaters (Romans 9:3), relying on their lineage for salvation (Romans 9:7-8), doubting God’s promise has been fulfilled (Romans 9:9, doubting like Sarah), relying on their works under Mosaic Law (Romans 9:10-13), and inviting God to harden them (Romans 9:15-18).