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 [1], 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 [2] 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.

The variety of explanations to questions about the origin of life, life after death or about the role itself of being in the world are built on the rational reflection that integrates the ideology of human beings as well as less rational practices and more emotional ones than in the whole nourish what has been called "beliefs". Therefore, the aim of this study was to construct an instrument to measure beliefs about the origin of life and life after death. A scale with a Likert 5-point response type was made up of 52 reagents; it was applied to 913 people of the Metropolitan Zone of Mexico City to obtain their psychometric characteristics, all whose schooling was either basic or an academic PhD degree. To identify the discriminative power of each test item, internal consistency, exploratory factor analysis and Pearson's correlation, data was analyzed using SPSS version 21. The final scale was formed by 48 reagents distributed in 4 factors that threw a Cronbach Alfa of 0.874. In conclusion, these results reveal a valid and reliable instrument as well as a useful tool for studying the phenomenon of the origin of life and life after death.

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Different explanations that have been created around the origin of the universe, human nature and the role of human beings. These explanations have been founded primarily on religious, philosophical and scientific responses based on the belief system. Prior to this premise, it became necessary to investigate what were the beliefs concerning the origin of life and the nature of the human population. Taking into consideration this objective there was a selected sample of 600 people from the general population who answer the five-point Likert type survey. Through statistical tests and validated instrument, it performed comparisons between the beliefs of people according to their sex, educational background, age and marital status. The statistical results showed significant differences between beliefs about the origin of life and human nature in the general population in terms of gender, educational background, age and marital status. Based on the results, the role of beliefs on the behavior of people is basically characterized by how knowledge is acquired on the basis of their theory and practice. Through these means, they know each other’s processes, scientific and nonscientific principles; and assisted on structuring their interaction with reality, the world, their peers and themselves.