Pew Research just released a huge, 248-page report about American Jews that explains this.
A large number of American Jews are Jews in name only.
Fully 27% of Jews do not call themselves Jewish by religion - and the number increases to 40% for those under 30.
Nearly 50% of US Jews hardly ever do anything associated with Jewishness.
25% of US Jews say they have hardly any Jewish friends.
Only 11% of Jews who don't identify with Judaism as a religion give charity to Jewish causes.
Not surprisingly, the Jews who have the least to do with Judaism are the ones who hate Israel the most. 18% of "Jews of no religion" support BDS, far more than the average.
Unfortunately, the survey didn't ask what levels of Jewish education Jews in America had. It seems obvious that those who know the least about their own religion and history are the ones who are the most likely to hate Israel now, and many of those get a thrill out of identifying "as a Jew" to buttress their ignorant opinions of Israel.
The survey is sad. It shows an American Jewish community that has utterly failed at attracting and keeping young people (with the exception of Orthodoxy.) Although most Jews still strongly support the Jewish state, the survey shows a growing disconnect between American Jews and Israel.
It shows exactly where the "As a Jews" are coming from.
