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Islam

In Islam, God (Allāh) is all-powerful and all-knowing, the Creator, Sustainer, Ordainer and Judge of the universe. God in Islam is strictly singular (tawhid) unique (wahid) and inherently One (ahad), all-merciful and omnipotent. Allāh exists on the Al-'Arsh, but the Quran states that "No vision can encompass Him, but He encompasses all vision. For He is the Most Subtle, All-Aware." (Quran 6:103) Allāh is the only God and the same God worshiped in Christianity and Judaism (Q 29:46).

Islam emerged in the 7th century CE in the context of both Christianity and Judaism, with some thematic elements similar to Gnosticism. Islamic belief states that Muhammad did not bring a new religion from God, but rather the same religion as practiced by Abraham, Moses, David, Jesus and all the other prophets of God. The assertion of Islam is that the message of God had been corrupted, distorted or lost over time, and the Quran was sent to Muhammad in order to correct the lost message of the Tawrat (Torah), Injil (Gospel) and Zabur.

The Quran asserts the existence of a single and absolute truth that transcends the world; a unique and indivisible being who is independent of the creation. The Quran rejects binary modes of thinking such as the idea of a duality of God by arguing that both good and evil generate from God's creative act. God is a universal god rather than a local, tribal or parochial one; an absolute who integrates all affirmative values and brooks no evil. Ash'ari theology, which dominated Sunni Islam from the tenth to the nineteenth century, insists on ultimate divine transcendence and holds that divine unity is not accessible to human reason. Ash'arism teaches that human knowledge regarding it is limited to what has been revealed through the prophets, and on such paradoxes as God's creation of evil, revelation had to accept bila kayfa (without how).

Tawhid constitutes the foremost article of the Muslim profession of faith, "There is no god but God, Muhammad is the messenger of God. To attribute divinity to a created entity is the only unpardonable sin mentioned in the Quran. The entirety of the Islamic teaching rests on the principle of tawhid.

Medieval Islamic philosopher Al-Ghazali offered a proof of monotheism from omnipotence, asserting there can only be one omnipotent being. For if there were two omnipotent beings, the first would either have power over the second (meaning the second is not omnipotent) or not (meaning the first is not omnipotent); thus implying that there could only be one omnipotent being.

As they traditionally profess a concept of monotheism with a singular entity as God, Judaism and Islam reject the Christian idea of monotheism. Judaism uses the term Shituf to refer to non-monotheistic ways of worshiping God. Although Muslims venerate Jesus (Isa in Arabic) as a prophet and messiah, they do not accept the doctrine that he was a begotten son of God.