Following Hans Küng's groundbreaking foundational works "Judaism" and "Christianity," this is the conclusion of his trilogy on the three Abrahamic religions. "In this book, I will tell a grand story that is immensely dramatic and multifaceted. However, I will repeatedly interrupt this story to critically question its origins in relation to the future. I am not primarily interested in the past, but in the present: how Islam has become what it is today - with regard to how it could be.".