Zionism was founded as a secular ethno-nationalist movement and to this day your entitlement to Israeli citizenship depends on your ethnicity, not your religion.

An atheist Jew is just as entitled to live in Israel as an ultra-orthodox one.

One should point out that Palestinian terrorism was originally largely secular too, with the secular Marxist group PFLP ranking up the highest body count.

The point being, this conflict does not need religion. Even if everyone involved became secular tomorrow, Palestinian nationalists and Zionists would still kill each other without needing any god to justify it.