Who is Israel? There are many of different tribes than Judah or Benjamin. Assuming that those in the modern nation Israel is all of the tribes and people, is wrong.
The descendants of Jacob. Which today is the reestablishment of Israel as prophesied by Isaiah 66:7-8
Jews are called Jews not necessarily because they are descendants of the Tribe of Judah, but because they acknowledge that their ancestors gave allegiance to the Kingdom of Judah and the Davidic Dynasty as opposed to giving allegiance to the northern Kingdom of Israel, noted for unashamed idol worship and a revolving door of would-be dynastic families.