what are we supposed to say again when christians ask us where we get our morality?

[Wyrd of Gawd]

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That's really just another way of saying "might makes right."

So I guess when cockroaches scurry into dark corners they are acting as moral agents? After all an evolved adaptation is an adaptation. What is the difference between human empathy and the cockroaches instinct to flee?

Actually it's the opposite of might makes right, because sociopathy is seen as abnormal and requiring control.

The cockroach comparison is an insipid equivocation, as no one has claimed cockroaches have developed society complex enough to require moral codes, and the only reason to make such a comparison would be out of a knee-jerk reaction.

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A moral code is not the same thing as an instinct. There seems to be an instinctual impression of right and wrong, but finer distinctions seem to be cultural.

You're also conflating moral agents with empathy, congratulations on the strawman.

Not all human societies have the same or similar moral codes. However, all time passes and the world becomes more integrated the vast majority of people are coming together based on common values (except for Repubs).