What IS good, and how do we determine it?

[Jenny A]

Some atheists who believe that objective moral right and wrong really do exist, a position also called moral realism, say they simply know that these moral truths exist, and that’s good enough for them.

Is that an opinion you've found expressed by anyone on this forum?  Because atheism is not a philosophy, and I really could care less what "some atheists" think unless it's a good thought.

Many atheists see to think moral realism is obvious, and easy to prove. I disagree.

Why bother to attack what isn't being argued?  Because it's easier than what's actually being said here and now?  I see no point in collectively discussing opinions not raised in the thread.  If you are a moral relativist fine.  Otherwise, why waste time shutting down an opinion not even raised.  Talk with the atheists you are talking to, not some atheists you find elsewhere.