“The average reader of the New Testament reads Matthew before Mark and then goes on to Luke and John. Matthew gives him the impression that Jesus was born God's Son in a miraculous fashion. Mark begins only with the baptism, but the reader will think little of this: perhaps Mark begins in medias res. With Luke we are back to a miraculous nativity for one born the Son of God. In John the reader learns that Jesus had already been God's Son from all eternity. But suppose one read Mark by itself, as its first readers did. What impression would one receive? Surely in a book where the main character shows up as an adult and, right off the bat, experiences a vision of divine calling in which he and no one else is told that he is God's Son, the natural inference would be that the baptism was the beginning of an honorific Sonship. If he were already God's son, wouldn't he have known it? And then why should God tell him what he already knew? It seems that Mark might believe what others in the early church did, namely, in Jesus' adoptive Sonship. Ebionite Jewish Christians and Cerinthian (also Jewish) Gnostics were adoptionists, rejecting any miraculous generation of Jesus Christ from the deity. [...] Once we know this was a popular, though eventually controversial, option among early Christians, it begins to make a new sense that the earliest gospel, Mark, sounds adoptionist but is flanked and overwhelmed by subsequent gospels that have moved the Sonship further and further back, attributing to Jesus some degree of divine nature in the process.”