“Religion” comes from the Latin “religionem” meaning “respect for what is sacred, reverence for the gods.” Cicero claimed it came from relegare meaning “go through again, read again,” from re- “again” + legere “read”. ‘However, popular etymology among the later ancients (and many modern writers) connects it with religare “to bind fast” (see rely), via notion of “place an obligation on,” or “bond between humans and gods.” Another possible origin is religiens “careful,” opposite of negligens.’ (http://www.etymonline.com/index.php?term=religion)
O.E. god “supreme being, deity; the Christian God; image of a god; godlike person,” from P.Gmc. *guthan (cf. O.S., O.Fris., Du. god, O.H.G. got, Ger. Gott, O.N. guð, Goth. guþ), from PIE *ghut- “that which is invoked” (cf. O.C.S. zovo “to call,” Skt. huta- “invoked,” an epithet of Indra), from root *gheu(e)- “to call, invoke.” But some trace it to PIE *ghu-to- “poured,” from root *gheu- “to pour, pour a libation” (source of Gk. khein “to pour,” also in the phrase khute gaia “poured earth,” referring to a burial mound; see found (2)). “Given the Greek facts, the Germanic form may have referred in the first instance to the spirit immanent in a burial mound” [Watkins]. Cf. also Zeus. (http://www.etymonline.com/index.php?term=god)
Zeus – supreme god of the ancient Greeks, 1706, from Gk., from PIE *dewos- “god” (cf. L. deus “god,” O. Pers. daiva- “demon, evil god,” O.C.S. deivai, Skt. deva-), from base *dyeu- “to gleam, to shine;” also the root of words for “sky” and “day” (see diurnal). The god-sense is originally “shining,” but “whether as originally sun-god or as lightener” is not now clear. (http://www.etymonline.com/index.php?term=Zeus)diurnal – late 14c., from L.L. diurnalis “daily,” from L. dies “day” + -urnus, an adj. suffix denoting time (cf. hibernus “wintery”). Dies “day” is from PIE base *dyeu- (cf. Skt. diva “by day,” Welsh diw, Bret. deiz “day;” Arm. tiw; Lith. diena; O.C.S. dini, Pol. dzien, Rus. den), lit. “to shine” (cf. Gk. delos “clear;” L. deus, Skt. deva “god,” lit. “shining one;” Avestan dava- “spirit, demon;” Lith. devas, O.N. tivar “gods;” O.E. Tig, gen. Tiwes, see Tuesday). (http://www.etymonline.com/index.php?term=diurnal)
Tuesday – O.E. Tiwesdæg, from Tiwes, gen. of Tiw “Tiu,” from P.Gmc. *Tiwaz “god of the sky,” differentiated specifically as Tiu, ancient Germanic god of war, from PIE base *dyeu- “to shine” (see diurnal). Cf. O.N. tysdagr, Swed. tisdag, O.H.G. ziestag. The day name (second element dæg, see day) is a translation of L. dies Martis (cf. It. martedi, Fr. Mardi) “Day of Mars,” from the Roman god of war, who was identified with Germanic Tiw (though etymologically Tiw is related to Zeus), itself a loan-translation of Gk. Areos hemera. In cognate Ger. Dienstag and Du. Dinsdag, the first element would appear to be Gmc. ding, þing “public assembly,” but it is now thought to be from Thinxus, one of the names of the war-god in Latin inscriptions.
The Sanskrit deva- derives from Indo-Iranian *dev- which in turn descends from the Proto-Indo-European (PIE) word, *deiwos, originally an adjective meaning “celestial” or “shining”, which is a PIE (not synchronic Sanskrit) vrddhi derivative from the root *diw meaning “to shine”, especially as the day-lit sky. The feminine form of PIE *deiwos is PIE *deiwih, which descends into Indic languages as devi, in that context meaning “female deity”.
Also deriving from PIE *deiwos, and thus cognates of deva, are Lithuanian Dievas (Latvian Dievs, Prussian Deiwas), Germanic Tiwaz (seen in English “Tuesday”) and the related Old Norse Tivar (gods), and Latin deus “god” and divus “divine”, from which the English words “divine”, “deity”, French “dieu”, Portuguese “deus”, Spanish “dios” and Italian “dio”, also “Zeys/Ζεύς” – “Dias/Δίας”, the Greek father of the gods, are derived.
Related but distinct is the PIE proper name *Dyeus which while from the same root, may originally have referred to the daytime sky, and hence to “Father Sky”, the chief God of the Indo-European pantheon, continued in Sanskrit Dyaus. The bode of the Devas is Dyuloka.
Religion is a collection of cultural systems, belief systems, and worldviews that establishes symbols that relate humanity to spirituality and, sometimes, to moral values. (http://en.wikipedia.org/wiki/Religion)
Religious experience (sometimes known as a spiritual experience, sacred experience, or mystical experience) is a subjective experience in which an individual reports contact with a transcendent reality, an encounter or union with the divine.
A religious experience is most commonly known as an occurrence that is uncommon in the sense that it doesn’t fit in with the norm of everyday activities and life experiences, and its connection is with the individual’s perception of the divine. Studying religious experience objectively is a difficult task, as it is entirely a subjective phenomenon. However, commonalities and differences between religious experiences have enabled scholars to categorize them for academic study. (http://en.wikipedia.org/wiki/Religious_experience)