I can understand what you mean here, though I am not sure I can totally agree. Like Xerxes being the Father? Would your heavenly Father kill anyone for coming to Him?I believe all of the OT is about Christ. I believe that Xerxes is a type of God the Father. Esther and Mordecai would be types of Christ. The Jewish people would be a type of the church. Haman would be a type of Satan and Hegai is a type of the Holy Spirit.
But dont you believe God gives faith and repentance? How could it be that no amount of faith or repentance that God gives would be enough for the same God to justify you? You actually believe that God would give a person repentance and faith and still count them as unjustified? Matt 7:21-23 NEVER mentions repentance and faith, but focuses solely on works.Being one with Christ. It's a passage used in parallel with Matthew 7:21-23. If you are not known by God, there is no amount of faith, repentance, good works etc to justify a sinner before a just God.