The Prophet Mohammad and the Lama Concress

For the most part, it seems that a literature of this kind of epic scale seems to have been written for the cailiphs and for their court. They seem to have actually harnessed a already existing tradition where people would preach and tell stories in mosques. And so there basisly telling the story, who are we? Where do we come from? How do we fit into god's plan, and why did he pick us, of all people, to be under the vanguard for his plan for all humanity?