I say this as a man who grew up in a Jewish household after my mom remarried, has a Jewish wife, and has two kids being raised Jewish.
The thing about most American Jews is that most of them really dont believe in Judaism. They believe in the rituals and traditions.
That obviously excludes the conservative Jews, but it is certainly true of most of the reformed Jews I know. And I know a lot of them.
I know a lot of conservative Jews (including myself), who have a wide range of opinions on politics, but not necessarily on religion.
In fact, the preservation of Conservative Judaism (which is an organized segment of Judaism) is strong and vital but has been under attack by the Secular Jews and Reform Jews/Reconstructionist Jewish school (many Recon women Rabbis are literally “Marxist-lites” and are more of a threat to Judaism today than is anti-Semitism because it corrodes from within like “Marxist-lite red ants”.
In the next presidential election in 2020, I would not be surprised if the Jewish vote for Donald Trump is over 40-45% because many American Jews are now waking up to the betrayal of Israel by the Democrat Party Left (Sanders, Ellison/Lopez, Warren, etc) that has been going on openly and covertly since the 1960’s.
You don’t have to belong to a shual or even go there to be “Jewish”. Judaism consists of a set of moral, ethical and legal principles to be followed throughout life, from the “Ten Commandments” to the “Commentaries”, “Tanach”, and even Martin Buber.
They are designed to guide a Jewish person (or even non-Jewish people) in a way of life, one that is positive, honest, productive, tolerant, and proud.
That does not include the Jewish Left, esp. many of the “Fake Jews” of the Democrat Party.