You know how the Old Testament Prophets had the Holy Spirit, so that God could speak to His people, and you know how God was in the tabernacle, and the temple, and how God says if His people obey Him He will walk among them…well, God did that with the Jews, not with other people, unless they converted. The people of Nineveh were saved from being killed in this life because of their repentance. To say that they continued to have a personal relationship with God by obeying the Law of Moses is just not stated in the scriptures. If the scriptures do not say it, then I do not say it.
Just read in Jonah how Jonah was on the ship, the Captain told Jonah, “How can you sleep? Get up and call on your god!” The people on the ship even greatly feared the LORD, and they offered a sacrifice to the LORD and made vows to him. Does that mean they were now God’s people too? I do not even venture to those thoughts, because God’s children had to obey the law, the ceremonial laws just to worship Him. The Bible says, “Remember that at that time you were separate from Christ, excluded from citizenship in Israel and foreigners to the covenants of the promise, without hope and without God in the world.” That is about the Gentiles and others. Do I think God cast all to hell who was not His children? No, I do not think that, but I do not think they were with Abraham either when they died. After Jesus was crucified, he went to the spirits in prison, to those who disobeyed before.
Again, the Jews were God’s children on earth in the Old Testament times.