The Gospel According To The Son is a good way to become familiar with the basic New Testament story of the life of Jesus without having to tediously compare all 4 Gospels of Matthew, Mark, Luke and John paragraph by paragraph. It is the same basic Biblical story that combines the various Gospels that we've all seen in several movies, except that it is told from Jesus' perspective of these events.
Nothing controversial or condescending here.
Most people don't realize, for example, that in the very first paragraph of the Gospel of Luke that Luke tells his readers that his Gospel is in fact not an eyewitness account but is based on several older hearsay accounts of the life of Jesus and that he has compiled his Gospel from those traditions believed and only written it as a narrative for his friend Theophilus. So just as Luke declares that his Gospel is not an "eyewitness" account but taken from older stories of the life of Jesus, so does Norman Mailer deliver his Gospel According To The Son story based on older traditional accounts, miracles included.