You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
With a POD of your choice any time after the birth of Prophet Muhammad, have the Islamic World be united under a single Caliph up until the present day. It's okay if some nations (particularly ones that willingly convert) are outside of the Caliphate, but have at least a continuous state across North Africa, Arabia, the Levant and Mesopotamia.
Bonus points if:
The Islamic Caliphate in the present day consists of at least the entire Arabic-speaking world
The Islamic Caliphate contained OTL Iran, Pakistan, Afghanistan, Central Asia as far north as Kazakhstan and at least part of China in the east at some point in its history
Bonus points if the Islamic world is dominant and the Christian/European world is a backwaters (or no longer exists at all)