Madeleine Albright never knew that her parents were Jewish until hearings were being held for her appointment as Secretary of State. Or at least that's what she said. She had no Jewish identity whatsoever, though seemed more gracious about discovering one. The public was nevertheless content to view her as Jewish, showing something about what that means. Does that make her a secular Jew? I'm not sure.
She told Time magazine in 2006 “I have a somewhat confused religious background.”