Not possessing a [[Religion|religious]] basis for [[morality]], [[atheist]]s are fundamentally [[Moral_relativism|incapable]] of having a coherent system of morality. For example, atheists have been the biggest mass murderers in history (see: [[Atheism and mass murder]]).
The [[Barna Group]] found that atheists and [[agnostics]] in America were more likely, than [[theist]]s in America, to look upon the following behaviors as morally acceptable: [[Illegal drugs|illegal drug use]]; excessive drinking; [[fornication|sexual relationships outside of marriage]]; [[abortion]]; cohabitating with someone of opposite sex outside of marriage; [[Profanity|obscene language]]; [[gambling]]; [[pornography]] and obscene sexual behavior; and engaging in [[homosexuality]]/[[bisexuality]].<ref>http://www.barna.org/barna-update/article/5-barna-update/58-practical-outcomes-replace-biblical-principles-as-the-moral-standard</ref> Given the [[Homosexuality and Health|many diseases associated with homosexuality]], the [[Bible|biblical]] prohibition against homosexuality is quite arguably one of the [http://creationwiki.org/Bible_scientific_foreknowledge many examples where the Bible exhibited knowledge that was ahead of its time]. See also: [[Atheism and homosexuality]] and [[Atheism and child pornography]]
[[James Randi]] is a leader within the atheist community. Brian Thompson, former James Randi Educational Foundation (JREF) Outreach Coordinator, wrote: