Basic Muslim Doctrine and Practice - God

Six key doctrines constitute the worldview of Islam, which are found in sura 2:177 of the Quran:

1. God. Islam insists that there is but one God, whose name is Allah. Allah, a personal God, is the creator, lawgiver and judge of the universe. In Arabic, Allah is grammatically incapable of the plural construction: Allah is the one and only God. The utter transcendence and oneness of God is repeatedly and militantly affirmed by Islam. Islam thus insists that God has no son or cohort. Certainly they disbelieve who say: Surely Allah, He is the Messiah, son of Marium; and the Messiah said:  Children of Israel! serve Allah, my Lord and your Lord. Surely whoever associates (others) with Allah, then Allah has forbidden to him the garden, and his abode is the fire; and there shall be no helpers for the unjust. Certainly they disbelieve who say: Surely Allah is the third (person) of the three; and there is no god but the one God, and if they desist not from what they say, a painful chastisement shall befall those among them who disbelieve. (surah 5:72-73)

Douglas Groothuis, Christian Apologetics, pp 601-ff