How do evolutionists/atheists explain the origin of evil?

As a Christian I believe that evil was created when a dirt-man gave one of his ribs to create a rib-woman who was convinced by a talking snake to eat some fruit.

But how do evolutionists explain it?
Update: "what species of snake is known for talking?"

We're talking about pre-flood earth here so it was radically different from the world we see today. So there were plenty of talking snakes around, same for wise-cracking donkeys and pusses-in-boots.
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