God looked down at his creation, humanity, and was disgusted with what it saw. The race had become so entrenched in hypocrisy and sin that it considered destroying it. However, evil abominations from beyond the Veil had snuck pass the plane barrier to introduce more chaos unto the planet. Realizing that he may still love humans, he set about coming up with a plan to save them.
The barrier that separates the mortal from the Astral Plane prevent God from affecting reality. The only way around this is to reincarnate himself as a mortal. It sent a piece of himself to be born on the Mortal Plane to grow up as a human male. This human would save humanity from itself and rally it against these outside forces.
However, there is a slight hiccup. The stress of the reincarnation caused by passing through the barrier caused the mortal to forget his memories of being a god. While he does understand that he has powers and abilities that others don't, he remains ignorant of his divine, godly heritage, and of his mission.
How can this mortal incarnation of a deity regain its memories?