Etymology of God (n.)

God2
Some trace it to PIE *ghu-to- "poured," from root *gheu- "to pour, pour a libation" (source of Greek khein "to pour," also in the phrase khute gaia "poured earth," referring to a burial mound. See also Zeus.

So we see that the word "God" refers to a poured libation or communion that invokes the supreme being. In the Rig-Veda, Indra's favorite drink was Soma - an entheogenic sacrament that induced heavenly visions.

http://www.sacred-texts.com/hin/rigveda/rv09011.htm