In Civilization VI, each civilization has two abilities. One is based on what the nation has done throughout history and the other is tailored to what happened during the ruler's reign. Saladin leads Arabia. From his promising start as a young scholar, Saladin and rose to become a legendary commander whose talents and wisdom won praise from his friends and enemies alike. Arabia's Special Ability is called The Last Prophet. When the next to last Great Prophet is claimed, Arabia automatically receives the last one if they haven't already received their prophet. This guarantees Arabia the ability to found a religion.
Saladin's ability is Righteousness Of The Faith which happens to be how you translate the word "Saladin". The worship building for Arabia's Religion cost very little Faith to build and produces bonus Science, Faith and Culture. Arabia can take advantage of the benefits of founding of religion without having to worry about racing for a Great Prophet. You'll want to have a Holy Site in many cities to take advantage of Saladin's ability as well.
Science and Religion blend in Arabia and this civilization is ideally suited for either kind of victory.
Mamluk - This Knight replacement heals at the end of every turn, even if it moved or attacked.
The Last Prophet - The special ability allows Arabia that when the next to last Great Prophet is claimed, Arabia automatically receives the last one if they haven't already received their prophet. This guarantees Arabia the ability to found a religion.