God's History
Yahweh was one of the gods of Earth, but his true origin varies from one account to another. Yahweh was part of a group of life-forms that existed before the Multiverse, and who were the only sentient life at that point.
Creation of the Universe
Yahweh allegedly created Earth-616 and all its multiple realities, including Duckworld, along with other universes (and the laws of physics), and that his job was "a contribution to a collective work called "Existence". Such universes were created for various reasons: Aesthetic expression, intellectual exercise, entertainment value, and money. This creation was a contract of UR&D (Universe Research and Development) supplier (God described his work as being "a supplier" rather than a creator), and legally speaking he wasn't the universe's creator.
Yahweh had a lot of trouble validating his universe to the committee. While they loved the pitch, including its multi-layered concept, both budget and intelligent life were problematic (as they were the only sentient life-forms at the time). Yahweh tried to settle for limited brain capacity, but eventually had to create Death (in order to prevent competition between them and the new life-forms). To negate that, Yahweh decided to add evolution in hiding, causing the life spans of those new life-forms to extend through science (and causing later the committee to try to destroy Earth with asteroids), and the Afterlife. This Multiverse became highly lucrative as a tourist destination, ensuring its existence. In the same way, Hell became a popular night spot.
Creation of Man
Yahweh reportedly created the first humans from the very dust of the Earth, but they were often tempted and led into sin by beings claiming to be Satan, who may or may not be Mephisto, or any number of other Hell-Lords.
The Flood
Allegedly, when God looked down at the Earth and saw the wickedness of man, he caused the Flood. Once the fFlood went away, he put a rainbow in the sky as a promise to the survivors who survived in Noah's ark that he would never again smite every living thing on the planet.
Since humanity didn't change, God decided to intervene, and thus the Spirits of Vengeance were born: a vestige of God's own power, bonded to human hosts. Those Spirits were placed into the care and overseeing of Zadkiel.
Ancient History
When God asked that all first born children of Egypt to be killed, the Asura were dispatched to carry out this task.
Man's religious texts, starting with the Old Testament and the Vedas were believed to be divinely inspired, a claim Yahweh rejected, stating that he didn't write "that badly."
God had a psychotic episode in Galilee due to the interaction between the dilithium that he was taking to control his tripolar disorder and antidepressants. This incident seemingly resulted in the impregnation of Mary of Nazareth with Jesus. Yahweh eventually married Mary, and stayed together with her for centuries. After almost two millennia of life together, his wife left him due to his drinking and possibly due to the age difference as well.
Modern Day
Since 1938 and due to the actions of Adolf Hitler, God started drinking at bender-level, going at Job's Place in Hell. He suffered from a tripolar disorder causing his appearance as the Triune: God, Jesus and the Holy Spirit. He also sometimes went trolling for virgins. During that time, he didn't speak to anybody.
Deuteronomy
After helping defeat Deuteronomy, an angel/demon hybrid destined to replace God, Howard the Duck ended up in Hell. He was led by Cherub Thrasher to Job's Place where God waited for him to give his thanks. He also revealed that he didn't inspire the writing of the sacred texts (the Old Testament, the New Testament, the Qu'ran, the Vedas or the equivalent of a divine book in Duckworld), and that he was working on a screenplay.
Heaven's on Fire
The fallen angel Zadkiel eventually managed to amass enough power to conquer Heaven and usurp Yahweh's place as the ruler of creation. Eventually, the Ghost Riders were able to stop Zadkiel, and then repelled the demonic horde of Kid Blackheart, securing the Holy City. Yahweh took back control of Heaven, and thanked Johnny Blaze via his wife Roxanne, but Blaze angrily stated that God would have to fight his own battles in the future. Zadkiel ended up in Hell, in the hands of Lucifer.
