God the Sustainer is the conception of God who sustains and upholds everything in existence.
Al Qayyum, sometimes rendered "The Sustainer" is one of the 99 Names of God in Islam.
"Creator, Sustainer, Redeemer" is reportedly a "common phrase" in Protestantism in the United States, specifically in Baptist liturgy.
[1] In the Christian theology, the described doctrine is supported by the following biblical and Deuterocanonical references: Moreover, there are other relevant places in the doctrinal Christian literature, for example: The conception of Deity in a sustaining/conserving/preserving mode is also used in Hindu theology where the Godhead, or Trimūrti in Sanskrit, consists of Brahma the Creator, Vishnu the Preserver/Sustainer, and Shiva the Destroyer.
In pantheism and pandeism (pantheistic deism) generally, God or some similar formulation is characterized as only needing to exist as a sustaining force, with no other aspect.