You claim what is impossible for you to know, it is a belief.
It is possible to "know" via witness and experience of the objective world compared against theories involving the characteristics of God and His involvement in His creation. There are no objective set of rules that even God followed.
No, it is an immoral place.
That would be to say that there is no morality to be found on earth. We already know that's not true. You are on pretty shaky logical ground here so far.
But that has nothing to do with the material universe being amoral. That is fact.
Yes, amoral even with a divine origin, so God has no moral characteristic if His creation contains and expresses His very nature, which is the Christian claim. Again your logic is getting tangled in a web trying to find some odd traction against what we already know about Christian doctrine.
You must remember, the vast majority of the world does believe in transcendent morality, so they would be acting immorally, not amorally.
That doesn't follow. It doesn't matter what one believes about the origin of morality. Morality is a measure of worth of an action towards common human objectives found in all humans. The moral efficacy of an act is not measured against what the actor believes about moral origins. That's just illogical.
Unless you are trying to claim they act amorally, because immoral doesn't compute.
I'm trying to say that despite the claim that God expresses an objective morality by nature, the nature He created is amoral and it is humans alone that add any semblance of morality in the landscape and it is only objective to our collective inner natures, not a distant deity's fiat.