The words ‘Jew’ and ‘Israel’ are interchangeable in the New Testament. This is not true of the Old Testament. At that time being a Jew could mean becoming a proselyte, or being of the tribe of Judah or Benjamin.
Understanding right division means understanding Israel and the role it played and will play. When reading Israel’s history, prophetic scriptures and how God was dealing with them, we can compare and contrast that to how he deals with us in the dispensation of grace.