How much of Israel will believe at the end of time?
At the end time, two-thirds of Israel will not believe, but one-third will believe. That believing third is called Israel, the believing remnant. So not every Jew is saved, yet all of the believing remnant of Israel will be saved.
Les explains that Jacob meant the deceiver or supplanter and referred to his unbelieving state, while Israel means a prince with God, so Israel was the believing Jacob. He then ties this to Isaiah chapter 9: the word came to Jacob, but only Israel heard, showing only the believer. At the end time, two-thirds of Israel will not believe; one-third will believe and be called Israel. Therefore all of Israel—the believing remnant—will be saved, though not every Jew is saved.