Is it possible to look at Muhammad's background and early Islamic history from a strictly historical viewpoint, by looking at texts from surrounding regions e.g. the Byzantine empire, Sassanian empire, Egypt etc.? It looks almost impossible to glean any historical fact from the Quran because it was written, revised and revised again long after the initial events.
The Byzantine Empire under Heraclius whacked the Persians, only for both to be overrun by Arab tribes fighting under the banner of Islam. Surely there would be some writings from the mid-600's on the Arabs that talk about their leadership, their motivations and political/social/religious structures. Then again, if the muddled history of Jesus is anything to go by, I'm not too optimistic.
I'm not a Quranic scholar, I only have an intense dislike towards Islam and religion in general (

) but I've been enlightened by the sharp minds on this forum. Maybe I could summarize my own limited knowledge about the history of early Islam as these points:
1. The Quran contains ideas from early Christian and Jewish sects present in Arabia
2. The language of the Quran shows familiarity with languages of many groups present in Arabia, although some borrowed words have totally different meanings in the original language
3. Muhammad's hijra story could have had a totally different origin before being finalized as the exile from Mecca to Medina
4. Muhammad's interactions with the Romans could have some element of truth to them
5. Most of Muhammad's later life story in the Quran and hadith are - to put it mildly - a steaming load of bullshit
6. Muhammad could have been a single person or an amalgam of various prophets and leaders
7. Whoever revised the Quranic narrative to jump from the Levant to Mecca/Medina must have made some mistakes, can we find these?