This book examines how socio-political surroundings have affected the evolution of Yārsāni religious thought and why the Yārsāni religious belief, despite its fundamental disagreement with Islamic tenets, has been affiliated with Islam. It also considers the historical context and socio-religious milieu in which the Yārsāni belief appropriates religious forces to survive, how Yārsānis experience their religion in Islamic society, and what differences are significant in their lived experiences. The author explores how the experience of worship influences real life for the Yārsānis from the perspectives of sociology, behaviorism, content analysis, cultural studies and ethnography in Iran and diaspora with focus on Sweden. Yārsāni followers became known as those who "don't tell secrets," primarily because they were not allowed to promote and advertise their religion in public, but recently have started to reveal their religion, especially in social media. This book discovers the transformation of this religion, and in particular in which context an individual can change the content of religion, and bring about new ideas regarding religion and belief.