Four Characteristics of Religion
There are two kinds of definitions. Some categoreis of things are easy to distinguish from other categories because thre are clear rules that everything in a category must obey. In analytic philosophy, such a definition is described as a set of necessary and sufficient conditions. Take, for example, the definition of a square number. There are numerous "necessary" conditions for something to be a square number. It must, of course, be a number. It must also be an even number, and not a decimal. The number one, being the unit, is discounted. But those conditions are not "sufficient" for identifying even numbers. In this case, the sufficeint condition is that the number has an odd number of factors. Hence, the number eight, though it meets the "neccesary" conditions, lacks the "sufficient" condition and is not a square.
Can a set of necessary and sufficient conditions for religion be determined? Many have tried. The nineteenth-century French sociologist Émile Durkheim offered that "a religion is a unified system of beliefs and practices relative to sacred things" with "beliefs and practices which unite into one single moral community called a Church, all those who adhere to them." There is much overlap here with the Four Characteristics of religion we will soon describe, but as a monothetic definition of the kind described above, it cannot hold water. For example, the language of a "unified" system of beliefs and practices is at odds with Hindu practice, which can just as easily be described as a family of religions (Vaishnavism, Shavism, Shaktism, etc.) with significant cultural overlap.
Consequently, a second type of definition is required for social science categories such as religion. This is a polythetic definition, where a series of common characteristics are outlined, and something "meets" a definition if it meets a sufficient proportion of those criteria. Such definitions are used in fields as wide-ranging as medicine, where a medical diagnosis of a condition like bipolar disorder requires the presence of at least four of a possible seven symptoms, or in political science, where the diverse manifestations of a phenomenon such as an "authoritarian regime" must be measured against a set of mutually agreed criteria.
The four characteristics of religion described below are central to the syllabus, but also widely used in scholarly writing on comparative religion. Must something meet all four criteria to be called a religion? This is difficult to say. The consensus seems to be that a "maybe" or an "in a sense" for one or perhaps two categories is okay, so long as there is a strong yes for the others. It is questionable, for example, whether Chinese religions such as Confucianism or Taoism always come with clear supernatural beliefs, even though they receive a thumping "yes" for Sacred Texts, Ethics, and Rituals.