I hate to point out the obvious, but the unwillingness of moral, Orthodox Jews to condemn or reject leftist atheist and even antisemitic Jews has created the same problem that Muslims have when they do not condemn or reject Islamism.
In other words, Orthodox Jews must finally *define* Judaism as a religion, not as a culture or philosophy or a people. And if someone does not embrace moral Judaism, they should no longer be called Jews.
It really is as serious as when some ancient Hebrews just could not *resist* making burned sacrifices of their children to Ammonite god Moloch. Today there are far too many Jews who do the same to the atheist god Marx.
In effect, the penalty must be near the same. For sacrificing to Moloch, Hebrews were to be killed. Even *not* killing such Hebrews was a crime in itself. Today failed Jews should not face real death, but only the death of expulsion, that they and their descent are no longer called Jews or recognized as such by other Jews.
Orthodox Jews (who are the minority) do exactly that, meaning condemn the liberalism; the liberal Jews do not listen and actually revile the orthodox types, even vilifying many as “ultra-orthodox” (just like the secular liberals here set up their “religious right” strawman).
It’s the exact reverse of what happens in Islam, where the liberals are the minority and the majority listen to radical imams. No comparison there.
Only 11 percent of US Jews (and 15 percent of Israeli Jews) identify themselves as orthodox these days, besides.
I have read that Orthodox rabbis in Israel have been trying to accomplish that very thing with their country's atheist leftists of Jewish parentage.