The institutionalization of religion in Europe and the Americas has been a complex and evolving process with profound historical, cultural, and social ramifications. In Europe, the establishment of state-sponsored churches, such as the Church of England and the Catholic Church in various countries, played a significant role in shaping religious landscapes. These institutions wielded considerable power, influencing politics, society, and culture for centuries. In the Americas, colonization brought a blend of religious imposition and religious freedom. European settlers, particularly the Spanish and Portuguese, imposed Catholicism on indigenous populations, often through forceful conversion efforts. However, the United States famously enshrined religious freedom in its Constitution, leading to a diverse religious landscape where various denominations flourish alongside secularism. Over time, the institutionalization of religion has undergone transformations, influenced by factors like secularization, globalization, and the rise of religious pluralism. This book aims to provide deep knowledge about this subject. The various changes and progress made this field are glanced at in this text. Those in search of information to further their knowledge will be greatly assisted by this textbook.