Religion is a system of social coherence based on a common group of beliefs or attitudes concerning an object, person, unseen being, or system of thought considered to be supernatural, sacred, divine or highest truth, and the moral codes, practices, values, institutions, and rituals associated with such belief or system of thought. It is sometimes used interchangeably with "faith" or "belief system"[1], but is more socially defined than that of personal convictions.

The development of religion has taken many forms in various cultures. "Organized religion" generally refers to an organization of people supporting the exercise of some religion with a prescribed set of beliefs, often taking the form of a legal entity (see religion-supporting organization). Other religions believe in personal revelation and responsibility.
There are many definitions of religion, and most have struggled to avoid an overly sharp definition on the one hand, and meaningless generalities on the other. Some have tried to use formalistic, doctrinal definitions and others have tried to use experiential, emotive, intuitive, valuational and ethical factors.

Sociologists and anthropologists see religion as an abstract set of ideas, values, or experiences developed as part of a cultural matrix. Primitive religion was indistinguishable from the sociocultural acts where custom and ritual defined an emotional reality.

Other religious scholars have put forward a definition of religion that avoids the reductionism of the various sociological and psychological disciplines that relegate religion to its component factors. Religion may be defined as the presence of a belief in the sacred or the holy. For example Rudolf Otto's "The Idea of the Holy," formulated in 1917, defines the essence of religious awareness as awe, a unique blend of fear and fascination before the divine. Friedrich Schleiermacher in the late 18th century defined religion as a "feeling of absolute dependence."

The Encyclopedia of Religion describes religion in the following way:

"In summary, it may be said that almost every known culture involves the religious in the above sense of a depth dimension in cultural experiences at all levels — a push, whether ill-defined or conscious, toward some sort of ultimacy and transcendence that will provide norms and power for the rest of life. When more or less distinct patterns of behaviour are built around this depth dimension in a culture, this structure constitutes religion in its historically recognizable form. Religion is the organization of life around the depth dimensions of experience — varied in form, completeness, and clarity in accordance with the environing culture." 
(Winston King, Encyclopedia of Religion, p 7693)