It is true, they couldn't understand that Jesus was a parent. They couldn't understand the relationship between Jesus and Christians, so they thought they were servants. They couldn't understand that they were children of Jesus, nor could they know to call Jesus father. Jesus was father and the Holy Spirit was mother's position. The most important key point in Christianity is to realize that Jesus was father and that Christians are children of Jesus and that salvation is not just forgiveness of sin, but rebirth.
Salvation is the new start of a new life.
Christianity couldn't understand the meaning of salvation, the relationship between Jesus and Christians. Christians are given new life through Jesus. Christianity has been great, but as you know, salvation through Christianity couldn't be the solution for this world. In spite of the Messiah's coming, this world was manipulated by Satan still, and the evil has been multiplied and multiplied. This world is satanic, so Christianity couldn't be a solution for this world, not because of faithlessness, but because of the crucifixion itself.