Christians believe that evil exists in the world as a consequence of the original sin committed by Adam and Eve in the Garden of Eden. According to the story, God created the world and everything in it, including Adam and Eve, who were the first humans. He placed them in the Garden of Eden and gave them free will to make their own choices. However, He also gave them one commandment: not to eat from the tree of the knowledge of good and evil. Unfortunately, they were tempted by the serpent (who was being controlled by a rouge angel otherwise known as the Devil) to eat from the tree, which they did, and this act of disobedience brought sin and evil into the world. Christians believe that this event had far-reaching consequences, not only for Adam and Eve but for all of humanity. They view the presence of evil in the world as a direct result of humanity's disobedience to God, and they see it as a reminder of our need for salvation and our dependence on God's grace.