Well, I don't know why Halachah would be the Jewish identity's heart. I am a Jew who is sur that God doesn't exist, so to me halakhah has a historic value, no more, and we don't have to follow it in any way if we don't want to. We must be free to think freely. To think using everything in life and Jewish history. And let me point out : zionism is a revolt against Halachah ; the Israeli law is not halachah and I hope it will never be, or else Israel will become Iran. Israel's fathers felt free to think differently from the religious law. Reform judaism as well. So what you say, Zev, is not, as you said, "that reality", this is only your point of view and it's easy to think differently.
Israeli PM to Palestinian President Abbas: We must fight terror together (Haaretz)
from the article: Converting Israel's conversion law