The point of God’s calling of Abram in Genesis 12 and 15 has nothing whatsoever do with the election or predestination of some to receive eternal life.
Instead, God’s calling of Abram was so that he would be a blessing to the world.
God did call Abram. But it was not necessarily unconditional, nor did it have to do with Abram’s eternal life. The calling of Abram was a calling to service.
God selected Abram to be a blessing to the world.