In the sense that society is physically capable of doing so, obviously you are correct; however, we are still left with authority having to meet whatever standard of good and bad society applies, and employ its violence so as to enhance the good, so that it ceases to be a net evil. It isn’t simply a matter of authority being justified in being violent solely because it is an authority.
Depends on what you mean by “religious issue.” It is certainly a moral issue, and it has a bearing on how we think of divine authority.
Well, there we’re getting into what’s good for whom and why. Suffering can be a path to enlightenment, if it’s handled properly, and if it’s within the capacity of a person to be handled. Or, in a more mundane context, the suffering that comes from exercise can result in a healthier body and greater enjoyment of life. But in both those cases, it’s a matter of resultant joy or pleasure outweighing the suffering, resulting in a net good.
Figured you would. 
Not human, but PERSONAL morality, and therefore can be used to define a person. The same consideration would apply to an artificial intelligence, an extraterrestrial, or even an animal intelligent enough to understand right and wrong (which means more species than people generally understand, although certainly not all animal species).
Not human being. Person. Incidentally, I wouldn’t say that a force of nature is less than a human being, just different, and the difference is such that moral judgments upon its behavior make no sense.
However, a superior person is still a person, not intrinsically different in this way. And while it may be argued that a human being lacks the full knowledge and capacity to judge the actions of God, it does not, in my opinion, make any sense to say that the actions of God are somehow immune to ANY judgment of whether they are good or evil simply because He/She/It is God. As long as God has free will, and so is capable of taking action that results in net good or net harm, then God is a person and so capable of morally meaningful good or evil acts.
This relates back to your statement about whether violence is good or evil depending on whether one is authorized to do them. But there must be a basis for authorization, and if the basis is simply “'Cause I’m da boss,” then you have a thuggery, not anything morally meaningful.
If the statement, “God is good,” is to have any meaning at all, it cannot be perfectly synonymous with “God is God.” Otherwise, all you’re saying is “'Cause He’s da boss.”
And this is what I cannot agree with. You are saying that God is good merely because He is God, not because He is good. You are positing a divine thuggery. I think that is nonsense.
Unless, of course, God isn’t a person, but is a force of nature instead. In that case, to ask whether He/She/It is good or not is a meaningless question.