not secular jews... Studies show that Secular people have a very low reproductive rate. (One of the main reasons why Western countries have such aggressive immgration policies) I would bet that most of the 30% that are under 14 come from Religious Jews. They take the commandment: "be fruitfull and multiply" to heart. As long as the religious are in Israel, then Israel will remain predominantly Jewish.
Ofir Akunis officially replaces Danny Danon as minister of science, technology, and space (Haaretz)
from the article: Israel on eve of Rosh Hoshanah: Population hits 7.5m, 75.4% Jewish