Islam is the second largest religion in the world in terms of numbers, with 1.6 billion adherents worldwide, according the CIA World Factbook.

Indonesia has the world’s largest Muslim population, making up 12.7 percent of the world’s Muslim population, closely followed by India and Pakistan, according to a study conducted by the Pew Research Center.

Islam is most predominant in the Middle East, northern Africa, and the horn of Africa, as well as in parts of Asia.

The Muslim holy book is the Qur’an, which describes the Five Pillars of Islam: the sole belief in the Islamic God, five daily prayers called Salat, the giving of 2.5 percent of one’s wealth to charity, fasting during the month of Ramadan, and a mandatory pilgrimage to Mecca, the holiest city in islam.

It is believed by Muslims that Mecca is where God revealed the verses to Islam’s last prophet, Muhammad.

Muhammad is regarded by non-Muslims as the founder of modern Islam.

Muslims believe in many important figures shared with Judaism and Christianity, such as Jesus, Moses, and Abraham, to be Prophets as well.