What was the being debating regarding Yom Kippur? What side of the debata does Eliezer fall on?

When the other prisoners celebrate Yom Kippur, Elie leaves the service. He cannot find a reason to bless God, nor, can see see evidence that the Jews are God's chosen people. After Elie leaves the service, he finds his father..... they understand each other completely and break bread together on that day of fasting.