In the world we are living in today we are facing inhumane cruel actions such as war in the name of religion and justice, even while they are historically testified against by religious theology. This historical view can be seen as early as 400 A.D when St. Augustine proclaimed that political gains cannot attain religious justification, because they tend to aim for selfish, earthly desires, as opposed to religion's aim for heavenly peace for all humans. This book contributes to resolving today's inhumane actions by presenting the theories of three Abrahamic religious theorists: St. Augustine, Martin Buber, and Ibn Khaldun. Their theories show the religions' theoretical commitment to morality and peace. The solution for inhumanity and cruel activities, as Buber suggests, is interreligious dialogue based on respect and morality, and a return to the ideas that Judaism, Islam, and Christianity share, so that the misunderstandings that have led to violence between these religions can be stopped.