Only about 20% of the Muslims in the world are Arabs.
It is often a habit of people to associate Islam with Arabs or with Arab countries. Indeed, Muhammad, the founder of the Islamic religion, came from Saudi Arabia. However, Out of all the Muslims living in the world, only about 20% of them are from Arab countries. The rest live in non-Arab countries like Indonesia, Iran, Turkey, Pakistan, India etc.
Bonus fact:
The country with the largest population of Muslims is Indonesia (about 13% of all Muslims in the world) with roughly 225 million Muslims.
Source
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