You can be an ATHEIST and still be a Reform Jew. I *hate* that the media counts them among the Jewish people Reform Jews are NOT Jews - any more than Messianic Jews.
They are creating deliberate confusion.
Generally, all organizations (pollsters, researchers, government, etc) counting “Jews” accept anyone who self-identifies as Jewish. They do this for other religions and minorities (mostly) as well.
Of course, Jew-haters count someone as Jewish if they’re suspected of having some indefinite percentage of Jewish blood regardless of that person’s claims about himself, or in spite of that person’s obvious background.