Freud's classic modernist text exposing religion as an illusion (a wish-fulfillment) within his own system of thought. Despite his arguments to the contrary, as full of assumptions and untestable theory as any other religious system, but an important milestone in cultural theory.
Freud's best known and most emphatic psychoanalytic exploration of religion, is the culmination of a lifelong pattern of thinking.
This book will help you understand Freud better! It's almost like a cliffsnotes on Freud. Not too hard to follow!