“Jew” can refer a person’s religion, but can also be an ethnicity. “Islam” is a religion and not an ethnicity. I couldn’t give less of a shit if you make fun of the Jewish religion. Do it all you like. It’s a moronic religion.
So the religion of Islam? Yeah, I’ll mock it. Arab culture? Nigerian culture? Malaysian culture? No. I won’t mock that.
You don’t choose your ethnicity. You choose your religion.