>How and when exactly did "Jew" become synonymous with "Hebrew" and "Israelite"?
Around time when out of 12 tribes one stood alone with only glimpses of others
>I literally just heard someone call Abraham a Jew.
That is but stupid, for he was forefather of Jude
He is Hebrew thought, Eber was his ancestor
>For that matter, why is Hebraism conflated with Judaism?
For only three religion can be traced to line of Eber but one of them is more bound to Christ and other is of illegitimate line of Ishmael
>And why are Judeans and Jews conflated?
Jew, Middle English: from Old French juiu, via Latin from Greek Ioudaios, via Aramaic from Hebrew yĕhūḏī, from yĕhūḏāh ‘Judah’