Judaism is a national culture that includes a religion. Just like being an American "includes" observing the Fourth of July. You do not have to observe the Fourth of July to be an American and you do not have to observe the Jewish religion to be a Jew. Witness the many Jewish atheists who nevertheless defined their ethnicity as Jewish.
UN agency warns school may be delayed for Palestinian refugees due to lack of funding (AP)
from the article: Abbas predicts 'very difficult' time for Palestinians after UN bid