Religious experience

Sometimes people make experiences which they see in the context of a belief system. They call these experiences religious experiences, spiritual experiences, sacred experiences, or mystical experiences. William James made the concept popular, in the 19th century. He did this to fight the growing rationalism of Western society. 
In many religions, such experieces are called revelations. This also applies to the knowledge that comes from them. These religions say that a god or gods caused these revelations, and that they are not a result of a natural cause. They are considered real encounters with God or gods, or real contact with higher-order realities of which humans are not ordinarily aware.
Skeptics say that these religious experiences are a normal feature of the human brain. As such, they can be studied in the same way other features of the brain are studied. To better be able to study them, scholars have classified such experiences in different ways.
Definitions.
Psychologist and philosopher William James described four characteristics of mystical experience in "The Varieties of Religious Experience." According to James, such an experience is:
History.
Origins.
The notion of "religious experience" can be traced back to William James. He used the term "religious experience" in his book, "The Varieties of Religious Experience". It is considered to be the classic work in the field. At professional conferences, people often cite this book. James makes a difference between institutional religion and personal religion. Institutional religion refers to the religious group or organization, and plays an important part in a society's culture. Personal religion, in which the individual has mystical experience, can be experienced regardless of the culture.
The term has been used before James, though. In the 18th, 19th, and 20th centuries, several historical figures said that religion and its beliefs can be grounded in experience itself. Many of these views had a lot of influence. Kant said that moral experience justified religious beliefs. John Wesley also thought that the religious experiences in the Methodist movement (paralleling the Romantic Movement) were a basis to religious commitment as a way of life.
Criticism.
The notion of "experience" has been criticised.
The term "Religious empiricism" is seen as highly problematic. Karl Barth saidf that the term was wrong altogether. Some influential modern scholars holding this liberal theological view are Charles Raven and the Oxford physicist/theologian Charles Coulson.
Robert Sharf points out that "experience" is a typical Western term, which has found its way into Asian religiosity via western influences. The notion of "experience" introduces a false idea of duality between "experiencer" and "experienced". In kensho there is no duality of observer and observed. "Pure experience" does not exist; all experience is mediated by intellectual and cognitive activity. The specific teachings and practices of a given tradition may even determine what "experience" someone has; this means that this "experience" is not the "proof" of the teaching, but a "result" of the teaching. A pure consciousness without concepts, reached by "cleansing the doors of perception", would be an overwhelming chaos of sensory input without coherence.