Hey now, don't interrupt plumjam when he's presenting his 100% irrefutable argument that all atheists are Stalin. With that kind of false cause and guilt by association reasoning, how can anyone in their right mind possibly disagree? Feel free to hop on the hamster wheel any time. Don't you know that every atheist alive today is a joint reincarnation of Josef Stalin, Mao Zedong, and Pol Pot? Don't you know that if atheists were left to their own devices, they'd slaughter millions of people in the name of Atheism?
In fact, the only thing keeping me from knifing and old lady and swiping her purse is the fact that I still secretly believe in God, and feel him breathing down my neck, watching everything I do. Morals and ethics could not have evolved, because we never see moral or altruistic behavior elsewhere in nature, and such behavior obviously offers no survival advantages whatsoever. All animals are savage beasts who eat their own young, and humans would be no exception, were it not for their unwavering faith.
Because science is materialistic and science doesn't have an absolute understanding of the nature of consciousness or human ethics, it stands to reason that there's more to reality than materialism. Since anything we don't fully understand, including that which exists outside of material reality, is ruled by God, it stands to reason that all morals must come from God. So what if it doesn't make any sense that a higher objective moral standard makes God an unnecessary moral exemplar, or that God's arbitrary will would make his morality purely subjective and unknowable? The answer to anything we don't understand, without exception, is "goddidit."
History shows us that perfect faith always has favorable results. The early Christians labeled the Jews "Christ-killers" and for centuries the Church incited people against them with accusations of blood libel and host desecration, even up to the 1940s. The Church went so far as to decree that baptism lacked the redeeming power to save Jews, and opened up their genealogical records to the Third Reich. Surely nothing bad could have come of that, and even if it did, well it's always an exception to the rule whenever fanatical theism results in the slaughter of millions of people. Therefore we can safely ignore these exceptions.
Finally, in case you still missed the point, All Atheists Are Stalin. Geez, don't make me repeat myself.