September 11, bomb attacks in Madrid and London with hundreds of victims, burning automobiles, homes, police stations, and churches all over the world: Truth claims paired with violence or its justification yield fundamentalism. This phenomenon can be found in all religions and worldviews. And yet a critique is justified: The term ‘fundamentalism’ is often used unjustly as a polemical form against those who think differently. This absorbing book enlightens and sensitizes to a serious problem in our terminology which hinders really understanding the problem. As a sociologist the author defines fundamentalism as a militant truth claim and then finds corresponding currents in all religions and worldviews.