In this essay, Freud examines the origin and function of religion, revealing the fundamental motivations of religion as the nostalgia for the father and the helplessness of the child as well as the adult in the face of nature and life.

He recognizes the historical truth preserved by religious representations and their decisive contribution to the maintenance of human societies, yet demonstrates the illusions they constitute, as they represent "fulfillments of the older, stronger, more pressing desires of humanity."

He proceeds to an analytical critical assessment of religion as the dominant illusion of civilization, focusing on the suspension of thought that it entails and paralleling it with obsessive-compulsive neurosis and delusional ideas.

Setting as his premise the human being's exit from childhood and their education to reality, he advocates for reason and a secular society. He champions the "primacy of intellect" with the assistance of science, expressing the hope that ultimately "humanity will overcome this neurotic phase, just as so many children mature and leave behind their similar neurosis"…