Atheists/evolutionists face two major logical problems to their worldview... good vs. evil and right vs. wrong. If an atheist or evolutionist believes in evil, then he also believes in God. Evil is God's opposite, philosophically speaking. Without God, evil doesn't exist. Much like dark is the absence of light, so is evil the absence of God. If God didn't exist, we wouldn't know what evil was. Evil things would still happen, but people would have no way of knowing if they were evil or not. We would have no word for evil, just like if light didn't exist then there would be no word for dark. If one believes in the existence of evil, then he believes also in the existence of God, though he may not realize it.
Furthermore, if you believe in right and wrong, then you cannot believe in evolution, at least not rationally. If humans are nothing more than highly evolved animals, then nothing we do is wrong. All of our actions are simply a part of our animal nature. They cannot be wrong, as such. For example, when a grizzly bear kills a salmon for lunch, we don't consider that act of killing wrong. It's just a part of the bear's nature. So global warming, for instance, if it is indeed caused by humans, wouldn't be wrong. Humans polluting the earth wouldn't be wrong, it would just be humans being human according to our nature.
If an atheist believes in evil, then he is not an atheist.
If an evolutionist believes in right and wrong, then he is not an evolutionist.
Someone who believes that global warming is caused by human error can not believe in evolution.
Someone who believes that homosexuality is right can not believe in evolution. Why? Because nature would eliminate homosexual behavior, if it was genetically linked. Those genes would be long gone due to the scientifically observed phenomena of reproduction. Philosophically, an evolutionist can believe that homosexuality is okay because an evolutionist doesn't believe in right and wrong. But, they would be forced to admit that sexual behavior is a choice and not something that someone is born with.
The attraction of the evolutionary theory is that it absolves humans of their sinful behavior. The flaw is that most humans, including members of the pseudo-scientific cult, still believe in right and wrong anyway. The two don't mix. Animals don't sin. Animals have instincts; they don't think about right and wrong. Humans are acutely aware of right and wrong. Humans are not animals, nor are we descended from animals.
Still, if you prefer to ignore all logic and rationality, feel free to do so. By all means, be a monkey! Embrace your monkey-hood! But, please, keep your feces away from me.