The extracts below are from the BBC’s ‘Religious Studies’ article ‘Judaism: good and evil.’
• G-d created everything, so G-d must also have created evil. If G-d is all-powerful (omnipotent), then evil will be under G-d’s control. If G-d is all-loving then it is reasonable to believe that G-d created evil for a purpose.
• When G-d created humans he gave them free will so that they could choose whether to worship him or not. If free will is to mean anything, then humans have to live in a world which allows them to make moral choices between good and evil. This is why G-d created evil.
The story of humanity’s battle with good and evil is told in the story of Adam and Eve in the Garden of Eden.