What does Atheism have to do with relative morality? What does the supernatural have to do with morality? Judeo-Christians, because of the fact that their religion contains a moral code, conflate the concept of god and morality. There is nothing relating these things besides the story of Moses claiming God gave him some clunky tablets with some ill organized and duplicated rules on them.
Right and wrong can be understood by the story of Genesis, which is an allegory about human evolution. When Eve ate the 'fruit of the tree of the knowledge of good and evil' it was in essence the time in human history that our brains evolved from the more animalistic intuitive-type to the more humanistic logical-type. At some point humans began to be able to empathize. Empathy the key to understanding morality. Animals do not empathize, and they do not know good from evil. We do not expect them to because they cannot empathize. So when humans could logically understand that hurting or killing something caused pain in that creature, that they themselves were also capable of enduring too, we knew right from wrong. We had eaten the fruit from the tree of knowledge of good and evil. This has nothing to do with ones belief or non-believe in a supernatural energy or force or god.
Now to follow up on Genesis, after Eve and Adam ate that fruit they immediately were kicked out of Eden. Which in the human mind this is indeed true. This is the original sin (read: missing the mark). Our brains are in flux. They are too big to be like the peaceful ignorant animals, but not big enough to be able to understand that our true selves are not the ruminating, repetitive, incessant stream of thoughts running through our minds. We are stuck in our tiny minds. Soon we will be forced to move on though, as everything does: change never ends. Soon we will be able to use our minds without identifying with them. We will remember our true essence.
In Genesis, agriculture came as soon as Adam and Eve at the fruit. They were smart enough to propagate plants. They were no longer animals. But they would be suffering until they were able to understand how to use their new big brains.
Atheists are not always relativists. The supernatural and morality have nothing to do with one another.
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