This is a common mis-perception about Israel. Allow me to correct it:
1) Jews are a people.
2) Judaism is the Jews' religion.
3) Under Israel's
Law of Return you are a Jew if your mother was Jewish, or if you've abandoned any other religion and joined the Jewish people through supervised religious conversion.
So you can even be a Muslim or Christian and immigrate to Israel, provided your mother was Jewish. You can be a Jewish Israeli and convert to Islam or Christianity. And you're not a "bad Israeli" simply because you choose to eat pork on Yom Kippur, or are Ahmedi, or break your egg on the small end instead of the big one.
It's the
peoplehood that matters to be an Israeli, not the religious observance. Thus today's Israelis experience only low levels of intra-religious conflict and are spared from the sort of upward spiral of religious- and power-seeking militancy that has plagued Pakistan.