You can read yet you cannot understand. There are many faithful non-trinitarian Christians who believe that Jesus pre-existed and still was not God and there are many who believe that he did not pre-exist and still these verses cause no trouble for either. The Father of all things knows the end from the beginning. He chose and glorified Jesus from before the foundation of the world for his appointed position as Messiah. Abraham saw Christ's coming and rejoiced, because he had faith that it would be.