Well, the Koran speaks against anyone who calls Jesus the son of God, even claiming that Jesus is going to appear on the last day and deny that he’s the son of God in several versus. The Koran denies Jesus’ crucifixion (claiming that it was an illusion or hologram or something to make it look like he was crucified), instead saying that he was caught up alive to “Allah” in heaven. As long as they believe that, they will come up with all sorts of stuff to justify the Koranic viewpoint.