If you define Zionism as its founders and Likud do, most American Jews are not Zionists:

“In the last few years, surveys have begun to suggest that a majority of American Jews do not support unconditional aid to Israel. Instead, they are willing to back conditions that military aid not be used to further Israel’s occupation of Palestinians. In fact, a substantial number of American Jews appear willing to go much further in criticizing Israel than community representatives like Daroff: A 2021 poll of Jewish voters by the Jewish Electorate Institute (JEI), for example, made waves when it found that a quarter of respondents agreed that Israel is an apartheid state.”

https://jewishcurrents.org/recent-polls-of-us-jews-reflect-polarized-community