Don’t say that! Just don’t. It is denigrating to your authenticity and it panders to the most extreme religiosity. Someone is telling you that you are not Jewish enough. You’re just sorta Jewish. Jew-ish.
No. Do not fall for the Official Story – that there is only one kind of Real Judaism and everyone else is less Jewish than the Official Jews. It is not now and has never been true. There is no one Judaism. There is no “The” Jewish tradition.
You’re not Jew-ish. You’re Jewish!