"This posthumously published book by Niklas Luhmann is arguably one of the most important works in the sociology and philosophy of religion of the last hundred years. It can only be compared in significance and scope to the works of Rudolf Otto, Mary Douglas, René Girard, Émile Durkheim, Max Weber, and Claude Lévi-Strauss. It is not just original, but also generative and indispensable: future discussions will have to refer to it, and it will become de rigueur and uncircumventable."—Eduardo Mendieta, Stony Brook University "Don't be afraid: this book does not preach atheism. This book is not about the existential concerns of one individual. Rather, it approaches religion as a system as vital to society as those of the economy, law, and love. Luhmann shows what makes religion unique to society, its special capacity to guarantee meaning even when meaning defies obvious verification. This book is a further step in Luhmann's general theory of society, a theory that remains unsurpassed as an approach to our times."—Nikolaus Wegmann, Princeton University