Abstract: Theists frequently aver that atheism is incompatible with moral realism (the view that there are objective moral facts). This paper defends a justifiable objective moral code, termed ethical rationalism (ER), that does not depend on the existence of any supernatural being. ER is a seven-principle moral code comprising two general prescriptions: do not harm others and help them whenever feasible. It is argued that ER (and hence objective morality) is justified by the fact that all moral agents would have a greater chance of achieving more of their plans of life leading to a long and fulfilling life if they lived in a society that followed ER rather than one that followed any other moral code.

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