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I am currently writing a timeline about Maurice ending Phocas's coup against him. In such a scenario, is the following possible?
Maurice defeats Avars.
Persians still attack. Perhaps later, but it happens eventually.
Heraclius the younger becomes Emperor.
A Christian Arab founds a new sect of Christianity based upon Nestorian Christianity. He wins followers at a blistering pace.
The Arab armies attack Rome and the Persians. While mostly unsuccessful, they manage to form a few new states between the two powers, and continue to infiltrate the Roman border regions, spreading their faith (I mean individuals, not armies).
Eastern Christianity slowly spreads throughout Persia.
TTL's version is Islam spreads through trade to various parts of the world.