Religion vs. mythology
Ancient polytheistic religions, such as those of ancient Greece, ancient Rome, the Vikings, etc., are often studied under the heading of mythology. Religions of pre-industrial peoples, or cultures in development to industrial conditions, are similarly observed by the anthropology of religion. Mythology can be a term used pejoratively by religious and non-religious people both (the religious person will in this case define another religion's stories as mythology). Here myths are treated as fantasies, or "mere" stories. But the study of religions, and the investigation of myths by psychology, not to mention how some myths turn out to have historical verification, has brought about a mixed, almost contradictory use of the term: some NRMs (New Religious Movements) such as Neopaganism actively research and use myths from older religions, both those that still exist and those that have disappeared.