Old Earth monotheistic religion based on belief in one God and Muhammad, circa 1399 to 1337 BT (570 to 632 c.e.) as the last of a series of Prophets of God. It became the largest religion on Earth by the middle Information Age, and split into a number of space-based sects during the Interplanetary Period.
The post-expulsion Stella Umma was based on a combination of Orbital Islam and reformed Earth-based Islam. Many thousands of worlds are part of the Umma Core and the Umma Shell, and Umma Islamic communities can be found on millions of other worlds.