It did expand east, that's why Iran, central Asia, Afghanistan, Pakistan, Bangladesh and Indonesia are all majority Muslim.Let's say Islam decides to expand east instead of the Levant and North Africa. What happens?
It did expand east, that's why Iran, central Asia, Afghanistan, Pakistan, Bangladesh and Indonesia are all majority Muslim.
It did expand east, that's why Iran, central Asia, Afghanistan, Pakistan, Bangladesh and Indonesia are all majority Muslim.
But they focus more on the east and barely touch the Levant and North Africa
Also Western China.
Northwestern China (Xinjiang). Tibet, not so much.
A better way to phrase this is "what if Islam does not expand west?" If the Byzantines are able to decisively defeat the Arab invasion of Egypt, specifically, then that would be a good start. Islam would most likely spread into Roman territory nevertheless, but it would not have the power of an established state behind it to encourage propagation. This might actually be a good thing for the Romans too, given that if the emerging Caliphate leaves well enough alone after having been gut-punched by Rome, they'll have the pressure of the Sassanids relieved.
Didn't Islam expand more east than west from the standpoint of Arabia? They did try to make significant inroads in Europe but nothing too permanent.
North Africa aside from Egypt has always been relatively sparsely populated.