This is an exploration of the relationship between evolutionary psychology, naturalism, and theological reflections, published by ESSSAT, the European Society for the Study of Science and Theology. How natural is religion? Is it a phenomenon written in our genes or brains, naturally developing with the development of the human race? The book considers the findings of evolutionary psychology from scientific, philosophical and theological perspectives and critically examines the relation between empirical, epistemological and theological notions. Chapters in the book deal with the naturalness of religion and religious experiences as based on genetics, biology and social psychology. Other authors examine the relationship between religion, science and theology with regard to the naturalness of religion from a more general perspective. The last part of the book includes views from a Muslim scholar and a historian.