Monotheism, a firm tenet of Muslims and Jews, refers to the belief in the unity of, or in one God. Because they believe the doctrine of the Trinity to be incompatible with monotheism, some groups of Christians reject Trinitarianism in favor of Unitarianism.

Monotheism is opposed to polytheism, the belief in the existence of many gods or divine beings. It has been widespread in human cultures, past and present, and has taken many forms. Natural forces and objects—celestial, atmospheric, and e...

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