I'm not sure what you're trying to imply by asking that. What exactly does that have to do with Christians having a moral obligation toward Jews and Israel?
It wasn't a trick question. I just asked you what was Paul trying to convey in Gal 3:16-29.
Paul says there was only one promised seed made to Abraham, and not seeds (v.16). The law which came 490 years after the promises were made to Abram, did not affect those promises (v.17-18).
Paul closes the chapter by saying.
Gal 3:28 There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.
Gal 3:29 And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.
Thus, all the blessings, and promises come via Abraham through the only promised seed. Abraham was justified solely by his faith, and before the law was given at Sinai.
There are believers, and non-believers. The Israelites have no temple, they have no priesthood, and therefore they have no sacrifice for their sins. The good news, is they have a God/Savior who loves them, and He will open their eyes to the gospel at a time of His choosing...