Idolatry is a major sin in the Abrahamic religions regarding image. It is usually defined as worship of a cult image, ideacitation needed] or object, as opposed to the worship of a God. In religions where such activity is not considered as sin, the term "idolatry" itself is absent. Which images, ideas, and objects, constitute idolatry, and which constitute reasonable worship, is a matter of contention with some religious authorities and groups using the term to describe certain other religions apart from their own.