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:
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)