Not possessing a [[Religion|religious]] basis for [[morality]], which can provide a legitimate basis for objective morality, [[atheist]]s are fundamentally [[Moral_relativism|incapable]] of having a coherent system of morality.<ref>
+
*[http://www.paulcopan.com/articles/pdf/God-naturalism-morality.pdf God, Naturalism, and the Foundations of Morality] by
+
Paul Copan
+
*[http://www.bethinking.org/morality/can-moral-objectivism-do-without-god Can Moral Objectivism Do Without God?] by Peter S. Williams
+
*[http://www.equip.org/articles/atheists-and-the-quest-for-objective-morality/ Atheists and the Quest for Objective Morality] by Chad Meister
+
*[http://carm.org/failure-of-atheism-to-account-for-morality The failure of atheism to account for morality]</ref> For example, atheists have been the biggest mass murderers in history (see: [[Atheism and mass murder]]).