Evil does exist in your world, but not in the form of a devil any more than God is in the form of a bearded man in the clouds. There is no horned being with a pitchfork, no dark, bearded man with a glint in his eye. Evil is the result of a complete lack of understanding of who and what the human truly is. It is a lack of understanding that the human body cloaks the sacred, holy spirit. If one recognized the Spirit within others, one would bow down on their knees and worship That. If one truly recognized the Spirit within themselves, they would revere every breath they took as sacred. They would honor the body as sacred and care for it with utmost respect. Acts of evil would be impossible.
And so, what you know as evil is nothing more than ignorance and misunderstanding. Have compassion for those who commit evil, for they are blind and deaf to the spirit within themselves and others. It is not anger and judgment that will change them or their acts, but love and forgiveness. You may not see the effects of your love and forgiveness in one who is profoundly blind and deaf in this lifetime, but you will have honored the Spirit, and there is no greater act than this.