....treated as a local magician by his people.
That is the point of the story, his people do not recognize him for what and who he was.
Even the book of Mark portrays Jesus in a more realistic light than John.
You raise a good question; Do the supernatural aspects of Jesus grow with each retelling? (each successive Gospel). B. Ehrman takes that position as support for a historical Jesus. I see how he comes to that, but he is dismissing the writer's style of subtlety. The reader is to come to the conclusion just as the centurion does at the end of the story:
Certainly, this was God’s Son!
This apparently frustrated some copyists sufficiently that they added this identification in the opening verse. 1:1
The beginning of the good news about Jesus the Messiah, (the Son of God)