What Mr Grinberg is trying to explain is not that a Jew is somebody that speaks Hebrew and lives in Israel. That would be the description of an Israeli, or an Hebrew. A Jew would be somebody who professes the Jewish faith, regardless of his nationality, language, culture and ethnical background. Israelis and Jews should be two distinct concepts.
Palestinians, IDF clash in Jalazone after funeral of teen killed by IDF on Friday (Haaretz)
from the article: You can't be a Jewish Muslim