The nihilist holds that all is permitted. The multiverse theorist holds that all that accords with the laws of inflation and quantum mechanics is permitted. Either way, though, the notion that there's a deity that lays down and subsequently enforces a unique moral law fades away.
The diety fades away in part because of the concept of infinity, that being, if the diety created the universe, who created the diety? However, the same concept of infinity raises the same question of where did all the energy/matter in the universe/multiverse come from?