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Diotrephes OK, if what you say is true about "“Zion” meant Jerusalem and, later, Israel as the people of God." how does that include you if you are a Gentile and not an Israelite/Hebrew/Jew? Your statement says Israel is the people of God, not the French, Italians, Chinese, Brazilians, Americans, etc.
The French, Italian, Chinese, Brazilians, Americans, me, and everyone are adopted into Israel when God saves us. When The Holy Spirit comes into our heart. Jesus says "You must be born again"
Abraham put God first, before anyone. He trusted God, so God saved him and his child. He will save you too and your children if you put Jesus first. God gave his only begotten Son, so we can live. Love is sacrifize. It is giving! Jesus expects us to give our life for our neighbors, not only for our kids. Love casts out fear. Abraham was a picture of God's love.
These are spiritual lessons that only those understand who walk with the Holy Spirit.