What is a Jew?
It uses to mean a practioner of Judaism. But because Judaism has a bloodline to Jacob built into it, it has an ethnic component. Some (wrongly) believe a racial component. However that's based solely on having a Jewish mother which isn't how genes work.
And some converted to Judaism but have no ancestry to the Levant, yet falsely claim they do so that they could steal land from Palestine. We call those TransSemites. The irony is, the people who really do have Hebrew and Canaanite ancestors who originally practiced Judaism but converted to Christianity or Islam are the Palestinians. Thus those who say they are Jews (based on descent) are not. And those who say they are not Jews, are (ancestraly).
Then you have my favorite, the Americans who don't follow Judaism but are Jewish because they are related to a TransSemite who survived the Holocaust. Since victimhood is currency then they are a Jew too.
Lastly is the one that makes zero sense, the "atheist" Jew. These claim they don't have a religion yet they believe the fictional history of that religion, and they accept the arbitrary division of the world into jews and gentiles that is also a concept invented by that self-alienating religion. They might have shaved off Some of the religion but if it isn't all then you're not an atheist your just less religious. Atheist don't believe Solomon or King David stories are any more real then King Arthur and Merlin stories.
Mike