@Justicar Jews are smart, they understand that blood ties are more binding than anything else. Judaism is all about being of Jewish ancestry and furthering that group's goals. It's an ethnic identity first and a religion second. Atheist Jews still consider themselves Jewish. Israel doesn't want you if you don't show proof of Jewish ancestry.

On the other end of the spectrum, you have the Shabbos goy (Christians and Muslims). They were conquered and adopted Jewish religions, that benefit the Js