Iolatry is usually defined as worship of any cult image, idea, or object, as opposed to the worship of a monothestic God. It is considered a major sin in the Abrahamic religions whereas 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 (sometimes resulting in iconoclasm).