Not literal marriage to a Physical God, that is, but a symbolic marriage to a less-tangible deity, who may or may not be real. Sometimes it's fairly benign — the girl in question (and it usually is a girl) simply serves as a priestess of the deity to whom she is wedded. Other times, this involves Human Sacrifice, in which case the god is probably either evil (possibly a demon or an Eldritch [...] [tvtropes.org]