Yes it may be necessary for the modern day sense of Christianity. But can I or any others be considered Christian without a belief in the divinity of Jesus? Muslims do not believe that Muhammad is divine. But divinely inspired.
The Gospels which are the main influence in the belief in the divinity of Christ. Could have been so influenced by Paul, who never met Jesus.
Does he have to speak with the divinity of God? Can he not merely be inspired?