I'm Jewish myself. A more precise phrasing is "both an ethnicity and a religion". Judaism isn't a nationality (there isn't a "Jewish Nation" all Jews belong to - there is Israel but not all Jews are Israelis).
Although there is a lot of both zionist and anti-semitic (different people) arguments that like to confuse them (Jews=Israeli) for political reasons.
I understand what you're saying, but I beg to differ.
Yes Jew doesn't equal Israeli, and from my understanding most non-religous Jews outside of Israel do not aspire to build a Jewish "Home" like Israel (A political entity which will also include a physical territory for the Jewish people), but as a former Jew of faith I know each orthodox religous jew across the world prays 3 times a day and in each and every holiday about the hope to build a Jewish homeland again in Jerusalem with the Temple in it.
With that being said, I think all the religous jews are definitely a nation, becuase they're ethnic group that hope to achive politcal establishment for themselves (or they're not hoping but already happy with what they have).