Most males born in the US are circumcised regardless of religious affiliation. It's not like circumcision alone makes someone part of the Jewish community. As I revealed earlier, I am a circumcised Jew, but What authority is controlling me? I am free to observe (or not) Jewish practices and traditions as I deem fit. Now having a US passport, or a driver's license, or a mortgage, or student loan debt? Those definitely place me under under control (financial or otherwise) of an authority. Being circumcised? I don't see how or by whom I am controlled.
> Could they leave anyway? Sure, the same way a person with gang tattoos can leave the gang.
Comparing membership of Jewish to membership of a gang seems pretty judgey. Maybe you're just anti-religion, and that's cool, but lets not compare Judaism, a world religion with thousands of years of history, to a gang. Unless you think all Christians also belong to a gang? Or like the vast majority of the world?