The New Dictionary of Cultural Literacy, Third Edition. 2002.
Islam
A religion, founded by Muhammad, whose members worship the one God of Jews and Christians (God is called Allah in Arabic) and follow the teachings of the Koran. Islam means submission to the will of God; adherents of Islam are called Muslims. The fundamental belief of Islam is There is only one God, and Muhammad is his prophet.
Muslims are obliged to pray five times a day, to fast in the daytime during the holy month of Ramadan, to abstain from pork and alcohol, and to make gifts to the poor. All of them are expected to make a pilgrimage to Mecca, Muhammads birthplace, at least once in their lives.