God knows the end from the beginning. He knew who would come to Him from the foundation of the world. Esau founded the Edomites and they attacked Israel from behind and killed the weak, old, sick, women and children. God does elect, but He also knows His people. As a Gentile believer I have been adopted into Jacob’s family and now have an inheritance, but only Jews that have accepted Jesus will be Spiritual Jews saved in the End of Days. Zech says Jesus will show His wounds to Israel and they will realize they crucified their own Messiah and repent. If a Muslim sees the wounds of Jesus will they repent? Only God knows.
The descendents of Esau, the Edomites or Idumeans were forcibly converted to Judaism by the Hasmonean Jewish kings in circa 100BC.
Herod the great was the son of one of those forcibly converted.
The Edomites merged with the jews and fought alongside the jews in the Jewish Roman wars. They fully assimilated with the jews by 132 AD.