"Entheogen" does
not literally mean "something that brings about a god within," it's more along the lines of "something that places you within god." From
Greek en-theos, within
god. A
subtle but important difference, even if that
interpretation does make the description less
profound. It also does not (by its originally translated meaning at least) necessarily have anything to do with
psychedelic drugs.
As I interpret it, an entheogen is anything that makes you feel as though you understand reality in the way a god might. Thus, many things are entheogens: learning, creating, art, sex, music, love, hate, science, drugs, reading, religion, dreaming, dancing, touching, power, and so forth.