I think the situation in Israel is complex, because it has such a diverse population.
The total fertility rate, by demographic group is as follows:
un.org/esa/population/publications/completingfertility/RevisedFriedlanderpaper.PDF
From those figures, we can see that the secular Jewish population is having children barely at the rate of population replacement. But they currently comprise 2/3 of the population of Israel.
Muslims and Druze (an Arab ethnicity whose faith split from Islam 900 years ago) have a substantially higher birth rate, but are only 1/6 of the population.
Religious and “ultra-Orthodox” Jews comprise 1/7 of the population, but their rate of births are substantially higher than the Muslims or Druze.
So, by birth rate alone, Israel will remain a majority Jewish state well into the future. However, there will need to be adjustments in Israeli society as religious and ultra-orthodox Jews increasingly become a larger segment of the population. Such strains are already evident, but perhaps we should discuss that in a separate thread?