Objective morality
Why we don't have christian chemistry, muslim chemistry and jew chemistry? Because chemistry is a science, and every science is objective, because it is always based on objective premisses.
So the same way that the only one true chemistry, or math or physics is the one that is based on objective premisses, and the others based on subjective premisses (like faith or personal beliefs) are all false, the same rationale we can use to morality.
The only true morality is the one that is based only on objective premisses, ie, reason and science, and not personal faiths or beliefs.
I have a different take on this. I don't know if all subjective fields are false... is art false? Don't you think something has to be objective to be falsifiable?
Most times I read about morality, the author is being prescriptive, telling us what we should think is good, instead of descriptive, trying to understand the reasons why we believe something is good.
The universe, it seems to me, doesn't care. Our minds, it seems to me, are much more concerned with consequences than principles. Don't you think that if one is interest in understanding more than taming morality, moral relativism offers more insight that objective morality?
i was trying to explain this very thing to a moral relativist just today.