monotheism

(Greek: monos, single; theos, God)

The religious system that admits belief in one and only one supreme God. First and foremost in this system comes Christian Monotheism which began with the establishment of Christianity by Jesus Christ. Its principal articles of faith are to be found in the early creeds of the Christian Church, such as the Apostles' Creed, the Athanasian, the Nicene. The principal present day forms of non-Christian Monotheism are:
New Catholic Dictionary

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