In some monotheistic religious denominations, the deities of pagan religions -- as well as other competing entities or objects to which particular importance is attributed -- are often called false gods. Conversely, polytheistic pagans may regard the gods of various monotheistic religions as "false gods" because they do not believe that any real deity possesses the properties ascribed by monotheists to their sole deity. Atheists, who do not believe in any deities, do not usually use the term "false god" even though that would encompass all deities from the atheist viewpoint. Usage of this term is generally limited to theists, who believe in some deity or deities, but not in others.
A false god is, in Abrahamic doctrines, a deity or object of worship that is regarded as either illegitimate or non-functioning in its professed authority or capability, and this characterization is further used as a definition of "idol". The term is often used throughout the Bible to compare YHWH, interpreted by Jews and Christians, or Elohim/Allah, interpreted by Jews, Christians, and Muslims, as the only real God. For example, 2 Kings 17:30 (NLV) states, with reference to false gods, "The men of Babylon made the false god Succoth-benoth. The men of Cuth made the false god Nergal. The men of Hamath made the false god Ashima".
An alternative usage of the term "false god" refers to anything that is considered to assume a place of undue importance in one's life; this usage is reflected in the viewpoint of some that "whatever we try to derive our core sense of meaning and worth is our god".