False god
A false god is, in Abrahamic doctrines, a deity or target 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 Yhvh (abreviation meaning the one who is), interpreted as the one true God, infinite, body-less and transcendental as compared to anthropomorphic deities of other, competing religions.
In Judaism, people who adhere to the noahide code, even although not being Jews, are said to worship the only true God.
In one way or another however, possible avenues of scriptural interpretation may invalidate one abrahamic religion over another. The oneness of God as the basis of a true religion has been raised by many other religions such as the Sihk tradition, unitarian universalists and Bahi's
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.