There's a high percentage of Jews in my profession, and I've found them to be all over the map in religious, ethnic, and cultural terms.Yeah, I know some, in fact my best friend in real life is one. He and his wife are ethnic and cultural Jews, but quite irreligious.
Same for Muslims, by the way. I asked my friend Navid if he was a Muslim. He said "By default, yes. I was born in Iran. In Iran, Muslim is all you're allowed to be." He's an atheist. Or maybe an agnostic. Whatever term best applies to somebody who doesn't know if there's a god or gods, doesn't care, and neither follows religious practice nor has any expectations of the Big Guy.