A false god is, in Abrahamic doctrines, a deity or object of worship that is either illegitimate or non-functioning in its professed authority or capability. The term is often used throughout the Bible to compare YHWH, interpreted as the one true God, infinite, body-less and transcendent as compared to anthropomorphic deities of competing religions.
In Judaism, people who adhere to the Noahide code, even though not being Jews, are said to worship the only true God.
The term has frequently come into prominence as a fighting word against people of other belief systems to underline the validity of one system of beliefs over the other.