This title is published in Open Access with the support of the University of Helsinki.How does Nietzsche, as psychologist, envision the future of religion and atheism? While there has been no lack of “psychological” studies that have sought to illuminate Nietzsche's philosophy of religion by interpreting his biography, this monograph is the first comprehensive study to approach the topic through the philosopher's own psychological thinking. The author shows how Nietzsche's critical writings on religion, and especially on religious decline and future possibilities, are informed by his psychological thinking about moods. The author furthermore argues that the clarification of this aspect of the philosopher’s work is essential to interpreting ...