The decline of ancient gods marked significant shifts in human beliefs, cultures, and societies, signaling the end of an era and the dawn of new religious paradigms. Throughout history, various indicators emerged that foreshadowed the waning influence and eventual decline of once-revered deities. These indicators were often intertwined with broader historical, cultural, and social transformations that reshaped the religious landscape of ancient civilizations. In this book, we explore the historical and cultural indicators that signaled the beginning of decline for ancient gods, shedding light on the complex forces at play during times of religious transition and transformation.