The present work proposes a psychological study via beliefs, about the origin of life, death, and life after death. Beliefs have played a decisive role in the development of humanity, from the primitive man who gave to the unknown divine forces, the judgments of the Holy Inquisition in the Medieval Age, the impact provoked by the conviction that the Earth was round on the belief of a flat Earth, and many other beliefs that sustain the behavior of the human being. In this context, the need arose to investigate the beliefs held by inhabitants of the Metropolitan Area of Mexico City towards the origin of life, death and life after death and with it, to know if there are differences in function of age and schooling; for this, the scale of Silva, Herrera and Corona was applied and with the purpose of obtaining the "t" of Student and ANOVAS the statistical package SPSS version 21 was used. The results show statistically significant differences between beliefs and sociodemographic variables age and schooling. Schooling: The more educated the population in general, the less likely they are to have religious beliefs. Age: The group of people between 35 and 45 years old are the ones who show a tendency to believe in scientific postulates about death, unlike those who are 60 years old and older.