quote=chunkeymonkey13q;1311812]
Islam might be butterflied away in this scenario, but as there is a consensus among some historians that Arabia was a sort of powder-keg in this period anyway, perhaps another religion (Christianity?, Zoroastrianism?) or a secular leader, would be able to unite the Arabians instead.[/quote]Well actually, the strenght of the Arabs during that period is often overestimated; even in OTL, it took the political-religious unifying factor of Islam
and an extremely devastating war between Persia and Byzantium that had conveniently ended just before Islam arose for the Arabs to succeed in dominating the Middle East.
Without either of those two factors, the expansion of the Arabs would either be significantly less successful than it was in OTL, or it would even fail completely.
..
Also keep in mind that there is no
need for Arabia to become properly unified, ever.
Just because it happened in OTL, doesn't mean that it's
bound to happen.
Without the emergence of Islam, however, this alternate Arabian expansion could happen a good deal later when the Eastern Roman Empire is in a much stronger position.
Ah, there's the all too common misconception that the Arabs didn't venture out of the Peninsula until the rise of Islam!
Arab tribes had already started migrating into Syria and Mesopotamia centuries before the rise of Islam, and some of the more powerful Arab tribes and tribal confederations carved out their own kingdoms in these areas.
The two most powerful pre-Islamic Arab states in this area were the Ghassanid kingdom in southern Syria, which was a vassal state of Byzantium, and the Lakhmid kingdom in southern Mesopotamia, which was a vassal of the Persians. To my knowledge, both kingdoms had been founded in the 4th century, or perhaps even as early as the late 3rd century.
And there had already been earlier Arab migrations in this area, and some of them took place a few centuries before Christ...
Before Islam, the Arabs migrated northwards as individual tribes, or at best tribal confederations, which was a result of the utter lack of political unity in Arabia - and in a scenario/TL without Islam, this will propably remain the same.
And those individual tribes will propably drift into Byzantine or Persian spheres of influence, just like they did in OTL prior to Islam.