Imagine the setup of the original Schrodinger's Cat; The cat is behind the wall, locked. I am adding another element to it, a person that will enter the room without the knowledge of the experimenter, and exit through another door and seal the place again. So for the Observer unaware of this, the wave function proceeds as expected and collapses when he finds out whether the cat has survived or not. The element of future correction, when sometime in the future, he becomes aware of the second observer knowledge is very peculiar.So the wave function will have to travel in the past to re-collapse again, with the newly acquired knowledge.So if there is an absolute observer, he will have the power to present you will the knowledge after the event had happened and ultimately change the course of the experiment, regardless whether it happened in the past or not. So a God, an absolute observer ;can', but not necessarily will, if he chooses so, change the already observed quantum event. The only thing that a god will not be able to do is changing the event which directly include our free will as an input into a quantum system.