"Many Jews don't eat pork."
Translation:Viele Juden essen kein Schwein.
It is not a core belief. It's a tradition that only strict jews adhere to, or people choosing to honor god in that way. There are many traditional laws that are no longer considered necessary by many non-orthodox. Otherwise we'd be popping out babies until we've had at least 2 girls and 2 boys, and a long list of other things that are not as relevent now as when they were written 3500 yrs ago.