What do monotheistic people believe in?

Monotheistic people believe in the existence of a single, all-powerful deity who is the creator and sustainer of the universe. This belief often includes the idea that this one God is unique, transcendent, and involved in human affairs. Major monotheistic religions include Judaism, Christianity, and Islam, each with its own interpretations and teachings about the nature of God and humanity's relationship to the divine. Monotheism emphasizes the importance of worshiping this one God and following the moral and ethical guidelines associated with their faith.