I'm saying that since the existence of objective morality is, by definition, more objectively moral than its nonexistence, some kind of moral standard must be true.
Is the existence of objective beauty by definition more beautiful than its non-existence?
Semantics. Fine, I should have said 'argument.' And this sentence is somewhat ironic in light of your views on morality.
Pointing out a logical flaw in an argument is, again, not semantics.
Nope, we're discussing the existence of an objective morality, independent of people's minds.
Which I would consider nonsensical. As I tried to explain with an absolutely good God.
But one that is either true or false. You haven't made any arguments for why objective morals don't exist; you've simply asserted that since different people believe different things, their perspectives are equally valid.
That's one possible conclusion. Another might be that without people there is no morality.
Saying something is immoral is a meaningless statement if morals are defined as opinions. You may as well say that you do not like murder, or that society frowns upon it. Why would we say that making lampshades out of the skin of Jews or Romani is wrong, if we believe that Hitler's opinion was equally valid?
You haven't made any argument that it isn't. I suggest that you simply assume that it is. But on what is that (implicit) assumption based?
I don't mean this in any condescending way, but the laws of formal logic are useful to understand my point:
2. The law of non-contradiction says that A cannot be both A and not A at the same time and in the same sense.
3. The law of excluded middle says that a statement is either true or false.
Apply these criteria to the statement "murder is wrong."
I think you missed the point. But I will illustrate: murder is generally considered wrong (as in Thou shalt not kill). But in war it is considered OK to kill the enemy. So, murder is wrong is both true and not true. It depends on the situation. If I defend myself from someone trying to kill me and kill that person in the process, I commit the very crime I am defending myself from. Yet one can easily argue that is not wrong, even though strictly speaking I have committed murder. (And I ignore the fact that we murder animals on a daily basis.)
So, 'murder is wrong' is not a statement about any absolute morality. In fact, I suggest no such statement can be made. (And I suggest no such statement can be made, simply because there is no absolute morality.)
But let's assume there is indeed an absolute morality (i.e. independent of people's minds). How then would people learn about this absolute morality? It seems to me this would still have to be processed by people's minds. I.e. 'people's minds' cannot be excluded from the definition. Therefore there is no absolute morality independent of people's minds.
Let's assume this absolute morality exists with God. Again the question is: how will people learn of it? To those of us who aren't blessed with heavenly visions (and, by the way, including those even) this will still have to be done through people's minds. How do we perceive anything, except through our minds?