What is the main conflict in Muhammad: His Life Based on the Earliest Sources by Martin Lings?

The biography's main conflict revolves around Muhammad's revelations and the reactions to his revelations from God. As he begins to have revelations, people begin to follow the prophet, a source of power that breeds conflict among the Quraysh, who are afraid of Muhammad and persecute those who follow him. The shift in power and religion causes a longstanding conflict.