Islam Quantum's Question

In this ground-breaking film, historian Tom Holland explores how a new religion - Islam - emerged from the seedbed of the ancient world, and asks what we really know for certain about its rise. The result is an extraordinary detective story. Traditionally, Muslims and non-Muslims alike have believed that Islam was born in the full light of history. But a large number of historians now doubt that presumption, and question much of what Muslim tradition has to tell us about the birth of Islam.

Is there any sound historical evidence that the prophet of Islam actually existed, or is the entire story of Muhammad fable or fiction?