If it wasn't for religion

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No, platonism is not another name for moral realism. 

From Wikipedia : “Moral realism (also ethical realism or moral Platonism)”

But you’re right not all realist need to be Platonist, but all moral platonist are moral realist.

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In that case then you've expressed an analytic truth by saying that we ought to do what is good, not given us a moral precept dictated by reality except in the most trivial sense, and that sense is not relevant to the question. So by your own admission, you have not provided a moral truth that is dictated by reality. All you've done is take advantage of what ought and good mean, which has fuckall to do with "what" one ought to do and how reality provides that moral. So, we're back to unfogged's original question. Name a moral that is provided by reality. So far, you have not done so.

No, what I was asked to provide is a moral aim or goal provided by reality, and what I provided is the mother of all moral goals and aims, that we ought to do good.

If you want a lesser one, here: we ought not rape innocent babies just for fun.

If you're trying to say that atheists are more likely to be moral nihilists than theists, I don't think that's true.

Yet nearly every advocate of moral nihilism, nearly every philosopher associated with that view, are atheists.

. If what you meant was that atheists are more likely to be moral subjectivists than atheists, that's not entirely clear either

Same as above.