If it wasn't for religion

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Yet, moral realism faces a considerable amount of criticism, both among professional philosophers and laymen, and clearly your own fellow atheists don’t seem persuaded by the arguments for it, to ever get off the fence.

That's a common misconception.  Moral realism doesn't actually face much criticism at all...particularly among philosophers. Purported realist statements face withering criticism..particularly -from- realist philosophers.

Your views are incoherent and contradictory.
You deny that goodness and badness exists as “stuff”, the when speaking about them as “mental designations” you say they refer to “stuff” out there in reality.

I don't say any such thing.  You say such things.   You say them, because you can't find anything contradictory, incoherent, or delusional about any of -my- statements..and....frankly, know far too little about the subject to ever be expected to find such a belief if I did possess it.  

In reality what you done is likely persuaded readers here more to defend subjectivism and relativism than realism, so good job.

You don't know what those things are, so how could you know that?

Okay please tell us what the existening referents for “goodness” and “badness” are, that are supposedly not “stuff”?

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Perhaps you believe that, are a moral subjectivist in this regard, good and bad, is sort of like your taste in music, or food, where goodness and badness are merely expressions of subjective preference. But it doesn’t even seem that most atheists here accept that, and tend to be averse to when people like myself try and reduce their moral views as such.

The notion that morals are emotional expressions is not subjectivism.  It's a form of non-cognitive moral theory called emotivism. Subjectivism... is a cognitive theory.

I’ll use this distinction between the two:

“emotivists, believe that moral propositions and ethical sentences are only expressions of emotions. Thus moral statements have no truth value, hence why they are non-cognitivists.

Subjectivists on the other hand believe that moral propositions and ethical sentences are a way of reporting emotions, and so these moral statements may be true or false depending on the attitude of the individual, hence why they are cognitivists.”