You find as you look around the world that every single bit of progress in humane feeling, every improvement in the criminal law, every step toward the diminution of war, every step toward better treatment of the colored races, or every mitigation of slavery, every moral progress that there has been in the world, has been consistently opposed by the organized churches of the world. I say quite deliberately that the Christian religion, as organized in its churches, has been and still is the principle enemy of moral progress in the world.

- Bertrand Russell

Quote Source: Why I Am Not a Christian and Other Essays on Religion and Related Subjects