This is the introduction to a book I have written about the radical mentality, which is a attitude that seeks to transform the world into something different, better than the one that we have inherited. It is a mentality seeks a kind of perfection, that people should be equal, and that they should get along and live in harmony. It is in my view also a totalitarian mentality, that is one that has to fundamentally change the kind of human beings we have been through all recorded time, and therefore has to control every area or virtually every area of our lives. Religions are totalitarian in every respect – since they seek the reformation of the individual – except one: outside of the Islamic world, they do not control the state. The decline of western religions after Darwin has been paralleled by the rise of radical ideologies – secular forms of the religious mentality. That is what this book is about.