@BillRM,
Until the time of Abraham, God dealt with all people as Holy God. There was compassion too.
God chose Abraham to begin a special relationship with "His people". We see a special individual relationship especially with certain individuals.
By the time of Moses, the Jews had grown in number. This was the beginning of God having a relationship with His people. Under His theocracy, God chose individuals to be leaders.
God told the Jews to reflect His Holiness to the world. The rest of the Hebrew Bible is basically a history of short periods of the Jews obeying God followed by longer periods of unfaithfulness to God.
God was strict during this time period. According to Christians God wanted His people to realize their need for Him Instead, they developed various rules for each of the 613 commandments
The death and resurrection of Jesus began the "Age of Grace". God wanted a personal relationship with each and every individual, whether or not they were Jewish.
For the most part, Christians have also done a poor job of reflecting God, especially after Constantine.
There is one age to come The Age of Grace ends The book of Revelation describes this period of time beginning with chapter 4.