This omnipotent, omniscient, omnipresent dude created the universe, the world, the biosphere the angels and humans and then kept punishing them for not living up to his expectations, so he sent a few prophets to set some ground rules, but that did not work...so he impregnated a virgin and told her son, a real stand up guy, to sacrifice himself in order to clean everyone's sins to set a shocking example of the extreme love he expects for the future. The end.
PS: his disciples also sent letters about theology to each other, about practical matters and the end of the world :o)