I'm glad to here your looking, in my younger years I went over this as well. What I would encourage you to do is make certain all the pieces fit.
your presentation and understanding has to include the other verse as well or else the complete word and understanding has become void and useless.
Many have taken this verse found in Romans 11 and neglected the others.
Like Romans 9:6
Matthew 3:9
Gal 3:6
But I'm confident that He who has began a good work in you shall complete it.
Phil 1:6
That you may be made complete in Him
Col 2:8-10
It's not Gal 3:6 above
It should be
Gal 3:16
Funny how necessary 3:6 is as well
Maybe its not a mistake at all :)
Indeed I'm looking...I suspect I always will be with everything in scripture...simply because I think we should always be open to God showing us something else, or leading us somewhere different.
But despite that, and despite my willingness to admit my take on Romans 11 may be incorrect, I'm not really sure the verses you've given allow for that interpretation.
Romans 9:6 doesn't speak to Israel's future, only that God's promises had not failed just because not all Jews had believed in Jesus. Paul says that God's promises were never to every single Jew, but to the 'elect' or 'remnant' of Jews down through the ages...the spiritual line of Abraham (which includes all Christians now), not necessarily the physical line of Abraham. Paul then goes on to speak of God's right to chose some and not the others...but it does not address the future of Israel there...in fact this passage, which clearly speaks of unbelieving Israel, then runs on into the passage that is still clearly speaking of unbelieving Israel, and says that after the 'fullness' of the Gentiles has been brought in, so to then shall Israel. So, I truly cannot see this as evidence against God's plan for this people in the future.
Matthew 3:9 again does not speak to ethic Israel's future. All it says it that no one...not even a Jew, should presume on God's grace. As Paul touches on later, just because you may claim Abraham as an ancestor, it does not give a person the expectation that God's promise holds to him...especially if they do not follow Christ.
Galatians 3:6-7 confirms that all who have faith are Abraham's descendants...spiritual Israel. But again, does not say either way what God's plans are for Israel.
Whoops...okay...you meant Galatians 3:16...lets see...well...the same deal really. We know that all the promises give to Abraham and his descendants where all for, to and because of, Christ. And that through these men all nations would be blessed....blessed because of Jesus and his life, death and resurrection. But still, how do we then draw a conclusion from this passage, or any of the above, that says God has no plans for the Jews? It simply does not say it...so when confronted by verses that say these thing about ethnic and not spiritual Israel, what must our conclusion be?
Now if their trespass means riches for the world, and if their failure means riches for the Gentiles, how much more will their full inclusion mean!... And even they, if they do not continue in their unbelief, will be grafted in,... Lest you be wise in your own sight, I do not want you to be unaware of this mystery, brothers: a partial hardening has come upon Israel, until the fullness of the Gentiles has come in. And in this way all Israel will be saved,... so they too have now been disobedient in order that by the mercy shown to you they also may now receive mercy.
Anyway, that's where I am now....still considering...but we'll see...