The headline might better read, “Baal worship confirms God’s favorite people are one”.
There are plenty of Hebrews who were not believers throughout Scripture. Nevertheless, God made contracts with the nation Israel, which he has never made with any other nation on Earth.
The significance of Israel as a nation is not merely genetic, but is also spiritual.
And how do we know of the Contracts G-d made to the ancient Jews? They are written in the Jewish Bible.
Of course the relations of the G-ds with the ancient Romans are only written in Latin and don’t count.
The relations of the G-ds with the ancient Greeks are written in (ancient) Greek and don’t count.
The relations of the G-ds with the ancient Hindus are written in the Vedas and don’t count.