Islam

Submission to God.

Core

Belief in one God and in Muhammad as the final prophet, with the Quran received as revelation. The Five Pillars structure practice, alongside the sunna of the Prophet.

Sunni and Shia divided over succession after Muhammad's death.
Sharia is a body of interpretation with several established schools.

Breadth

The largest Muslim populations are in South and Southeast Asia rather than the Arab world, and practice varies enormously across those regions.