The Egyptian philosopher Akhnaton and the American philosopher Charles Hartshorne both believed that God was constantly self-creating.

Akhnaton

An ancient Egyptian pharaoh of the Eighteenth Dynasty who is noted for attempting to institute a monotheistic worship of the sun disk Aten.

Self-Creating

The concept of something or someone coming into existence or being through its own inherent capabilities, often used in philosophical and metaphysical discussions about the nature of being and creation.