Israel was elected as a people, not as individuals. Individual people could be exiled from Israel and cast out into the wilderness. Israel was predestined for a certain role but no individual person was forced into that role.
Besides this, when Israel was a chosen people, this did not guarantee any ultimate salvation. They had a certain role to play, and they were chosen for this role. They were the physical line of the messiah, they were selected to carry the scriptures.
If Calvinism would be more careful with the reading of the scriptures, they would notice that the saints are likewise predestined for glory, but that the body of Christ is that of which we might become members, not some list drawn up "before time began" without regard of faith and repentance.
Abraham is (the father of faith) and father of many nations. (then and NOW)
Abraham believed God and it was accounted to him as Righteousness. (Galatians 3:6)
God promised Abraham a land for his descendants. Abraham had Isaac, Isaac had two sons
Esau and Jacob. Jacob received the blessing from Isaac and the lineage came down to Jesus
Christ. (The Savior).
Jacob had 12 sons that subsequently became the 12 tribes of Israel. Israel was placed into bondage by Egypt and Moses (by the hand of God) delivers them from out of the bondage of Egypt to the wilderness in order to know Him and worship Him.
Moses receives the 10 Commandments from God in order to modify their behaviors so
they could have peace among themselves and have peace with God. While in the wilderness
some of the people chose not to follow Moses (and God) they became rebellious and unbelieving.
The people who chose not to follow God and Moses, were cast out of the assembly.(community). Those people died very quickly due to their rebellious spirit and unbelieving hearts.
The people of Israel had a choice to follow and be blessed or to go their own way. Those who
followed were blessed and enjoyed the “land of milk and honey” instead of BONDAGE. The Bible states in Romans 11:26 "And so all Israel shall be saved: as it is written, There shall come out of Zion the Deliverer, and shall turn away ungodliness from Jacob:"
Today the same choice is given, believe God and follow him through his Son, Jesus Christ our Savior, and be blessed and inherit Eternal life. or rebel and refuse to believe God and on His Son, and be cast into the 'Lake of Fire' along with the Devil (Who represents rebellion and unbelief) and his angels (those who inspire people today to rebel and to not believe GOD.)