Since there's not even agreement on the origin, scope, nature, and purpose of morality, how can there be any answer? Even the idea that morality is or ought to be life-centered is done within a social context insofar that life and its various caveats are subject to varying ideas. Where do we even begin measuring the morality of another person, society, and their actions? In the 'strategic view' of a globalizing humanity, is religion even relevant or legitimate in defining morality? The problem IMO is not whether cultures are morally equal or not, but what obligations the answers may compel upon people. If cultures are morally equal, then what right does my country have in intervening (politically, legally, militarily, etc) in the social affairs (racism, genocide, etc) of another state?