I did not read the book. However, before the time of Jesus, the Jews were expecting a different type of Messiah, someone who was rich and powerful and could subdue the enemies of Israel. Jesus did not fit that type. Jesus was more about love and forgiveness and blessed are the poor. This was not expected of the anticipated Messiah, since Jesus was acting humble and poor and not strong and rich.
Before Jesus began his ministry he went into the desert to fast and pray. He was visited by Satan, who, among other things, offers Jesus all the wealth and power of the kingdoms of the earth if Jesus would bow and serve Satan. Satan had been the Lord of the Earth in charge of humans since the time of Adam and Eve. Had Jesus accepted that offer. he could have become the expected Messiah, since Satan had that authority. However, that meant Jesus would have been under Satan in the chain of command.
Instead, Jesus chose differently and rejects Satan offer to fulfill the Messiah prophesy. This would lead to a political battle in Heaven, from which Satan and his allies would be expelled from heaven; Red Dragon of Revelations. The implications was Jesus did not follow the Old Testament script, when given the chance. He saw a higher goal; take over Satan's Job. This was a tough pill to swallow.
My interpretation is based on the inference that God was on Sabbath rest all through the Old and New Testament, and that others were doing the work, as God rested. The Sabbath of man was a reflection of heavenly things. One cannot work on the Sabbath, and if work needs to be done, it needs to be done in advance; preparations, or have other others do needed work for you.
God made provisions with Satan in the Garden of Eden before his rest began. Satan would become the Lord of the Earth to care for Adam and Eve, and their future, as he rested. God does not get back to work until late in Revelations. This is when epic creation begins again; Heavenly Jerusalem descends to earth and a new heaven and earth, are created.
When Jesus said nobody has seen the father, but the son, it was referring to the Sabbath being for the family and not for business. This shocked people to the core. People like Paul; Saul, would see, and come to terms, changing 180 degrees. Others were too invested to change.