We are not of this world
As Christians, although we live in this world, we are not of this world. This world is a place of darkness ruled by the prince of the power of the air; Satan (Ephesians 2:2). Satan is referred to as the ruler of this world in John 12:31 and hence evil is manifested in this world in various forms. But as believers, we have been translated from the kingdom of darkness into the kingdom of light.