How did Israel's rejection of God's promises result in our salvation?
Israel's rejection of everything God had promised brought about what had to be done for our salvation: His sacrificial death, His burial, and His resurrection. Because they rejected what God had promised, the necessary saving work was accomplished, and that work is for our salvation.
Les teaches that because they rejected everything God had promised, they brought about what had to be done for our salvation—His sacrificial death, burial, and resurrection. He then contrasts two facets: believing in God and believing God. Many people, especially in America, will admit they believe in God, but that does not require faith. Believing God narrows it down, because that is faith: taking God at His Word. The Gentiles for thousands of years did not believe God; they may have believed in some God, but they did not believe God.
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Why did Israel rejecting everything God promised end up bringing about our salvation?
Because Israel rejected everything God had promised, they brought about what had to be done for our salvation — His sacrificial death, burial, and resurrection.