Initiation in the context of "Religious"

Sacred mysteries are the areas of supernatural phenomena associated with a divinity or a religious belief and praxis. Sacred mysteries may be either:

1. Religious beliefs, rituals or practices which are kept secret from the uninitiated.
2. Beliefs of the religion which are public knowledge but cannot be easily explained by normal rational or scientific means.

A mystagogue or hierophant is a holder and teacher of secret knowledge in the former sense above, while mysticism may be defined as an area of philosophical or religious thought focusing on mysteries in the latter sense.

Religion is a range of social-cultural systems, including designated behaviors and practices, ethics, morals, beliefs, worldviews, texts, sanctified places, prophecies, or organizations, that generally relate humanity to supernatural, transcendental, and spiritual elements—although there is no scholarly consensus over what precisely constitutes a religion. It is an essentially contested concept. Different religions may or may not contain various elements ranging from the divine, sacredness, faith, and a supernatural being or beings.

The origin of religious belief is an open question, with possible explanations including awareness of individual death, a sense of community, and dreams. Religions have sacred histories, narratives, and mythologies, preserved in oral traditions, sacred texts, symbols, and holy places, that may attempt to explain the origin of life, the universe, and other phenomena. Religious practice may include rituals, sermons, commemoration or veneration (of deities or saints), sacrifices, festivals, feasts, trances, initiations, matrimonial and funerary services, meditation, prayer, music, art, dance, or public service.

Baptism (from Koine Greek: βάπτισμα, romanized: váptisma, lit. 'immersion, dipping in water') is a Christian rite of initiation almost invariably with the use of water. It may be performed by sprinkling or pouring water on the head, or immersing in water (partially or completely), traditionally three times for each person of the Trinity. It is also called christening, although this is typically reserved for the baptism of infants. Baptism is regarded as a sacrament in most churches and an ordinance in others, with the synoptic gospels recounting that John the Baptist baptized Jesus.

Baptism according to the Trinitarian formula, which is done in most mainstream Christian denominations, is seen as being a basis for Christian ecumenism, the concept of unity amongst Christians. In certain Christian denominations, such as the Catholic Churches, Eastern Orthodox Churches, Oriental Orthodox Churches, Assyrian Church of the East, and Lutheran Churches, baptism is the door to church membership, with candidates taking baptismal vows. It has also given its name to the Baptist churches and denominations.

The Eleusinian Mysteries (Greek: Ἐλευσίνια Μυστήρια, romanized: Eleusínia Mystḗria) were initiations held every year for the cult of Demeter and Persephone based at the Panhellenic Sanctuary of Eleusis in ancient Greece. They are considered the "most famous of the secret religious rites of ancient Greece". Their basis was a Bronze Age agrarian cult, and there is some evidence that they were derived from the religious practices of the Mycenean period. The Mysteries represented the myth of the abduction of Persephone from her mother Demeter by the king of the underworld Hades, in a cycle with three phases: the descent (loss), the search, and the ascent, with the main theme being the ascent (ἄνοδος) of Persephone and the reunion with her mother. It was a major festival during the Hellenic era, and later spread to Rome.

The rites, ceremonies, and beliefs were kept secret and consistently preserved from antiquity. For the initiated, the rebirth of Persephone symbolized the eternity of life which flows from generation to generation, and they believed that they would have a reward in the afterlife. There are many paintings and pieces of pottery that depict various aspects of the Mysteries. Since the Mysteries involved visions and conjuring of an afterlife, some scholars believe that the power and longevity of the Eleusinian Mysteries, a consistent set of rites, ceremonies and experiences that spanned two millennia, came from psychedelic drugs . The name of the town, Eleusis, seems to be pre-Greek, and is likely a counterpart with Elysium and the goddess Eileithyia.