thumb|Maa [[Kali|Bhavatarini (Kali) idol at Dakshineshwar Kali Temple, famously worshipped by Swami Vivekanand (1863–1902) in September 1884]]

thumb|Illustration depicting worship of the [[golden calf idol]]

Idolatry or idol worship is the worship of an idol as though it were a deity. In Abrahamic religions (namely Judaism, Christianity, and Islam) idolatry connotes the worship of something or someone other than the Abrahamic God as if it were God. In these monotheistic religions, idolatry has been considered as the "worship of false gods" and is forbidden by texts such as the Ten Commandments.

For instance, the phrase false god is a derogatory term used in Abrahamic religions to indicate cult images or deities of non-Abrahamic Pagan religions, as well as other competing entities or objects to which particular importance is attributed. Conversely, followers of animistic and polytheistic religions 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 choose to worship some deity or deities, but not others. It is a means to focus one's religious pursuits and worship (bhakti). In the traditional religions of Ancient Egypt, Greece, Rome, Africa, Asia, the Americas and elsewhere, the reverence of cult images or statues has been a common practice since antiquity, and idols have carried different meanings and significance in the history of religion. Moreover, the material depiction of a deity or more deities has always played an eminent role in all cultures of the world. The destruction of images as icons of veneration is called iconoclasm, and this has long been accompanied with violence between religious groups that forbid idol worship and those who have accepted icons, images and statues for veneration. The definition of idolatry has been a contested topic within Abrahamic religions, with many Muslims and most Protestant Christians condemning the Catholic and Eastern Orthodox practice of venerating the Virgin Mary in many churches as a form of idolatry.

The history of religions has been marked with accusations and denials of idolatry. These accusations have considered statues and images to be devoid of symbolism. Alternatively, the topic of idolatry has been a source of disagreements between many religions, or within denominations of various religions, with the presumption that icons of one's own religious practices have meaningful symbolism, while another person's different religious practices do not. The word eidololatria thus means "worship of idols", which in Latin appears first as idololatria, then in Vulgar Latin as idolatria, therefrom it appears in 12th century Old French as idolatrie, which for the first time in mid 13th century English appears as "idolatry".

Although the Greek appears to be a loan translation of the Hebrew phrase avodat elilim, (עבודת אלילים) which is attested in rabbinic literature (e.g., bChul., 13b, Bar.), the Greek term itself is not found in the Septuagint, Philo, Josephus, or in other Hellenistic Jewish writings. The original term used in early rabbinic writings is oved avodah zarah (AAZ, worship in strange service, or "pagan"), while avodat kochavim umazalot (AKUM, worship of planets and constellations) is not found in its early manuscripts. The later Jews used the term , avodah zarah, meaning "foreign worship".

Idolatry has also been called idolism, iconolatry or idolodulia in historic literature.

Prehistoric and ancient civilizations

The earliest so-called Venus figurines have been dated to the prehistoric Upper Paleolithic era (35–40 ka onwards). Archaeological evidence from the islands of the Aegean Sea have yielded Neolithic era Cycladic figures from 4th and 3rd millennium BC, idols in namaste posture from Indus Valley civilization sites from the 3rd millennium BC, and much older petroglyphs around the world show humans began producing sophisticated images. However, because of a lack of historic texts describing these, it is unclear what, if any connection with religious beliefs, these figures had,

The earliest historic records confirming idols are from the ancient Egyptian civilization, thereafter related to the Greek civilization. By the 2nd millennium BC two broad forms of cult image appear, in one images are zoomorphic (god in the image of animal or animal-human fusion) and in another anthropomorphic (god in the image of man). The former is more commonly found in ancient Egypt influenced beliefs, while the anthropomorphic images are more commonly found in Indo-European cultures. Symbols of nature, useful animals or feared animals may also be included by both. The stelae from 4,000 to 2,500 BC period discovered in France, Ireland through Ukraine, and in Central Asia through South Asia, suggest that the ancient anthropomorphic figures included zoomorphic motifs. In Ireland, iconic images included pigs.

The Ancient Egyptian religion was polytheistic, with large idols that were either animals or included animal parts. Ancient Greek civilization preferred human forms, with idealized proportions, for divine representation.

The ancient philosophy and practices of the Greeks, thereafter Romans, were imbued with polytheistic idolatry. They debate what is an image and if the use of image is appropriate. To Plato, images can be a remedy or poison to the human experience. Fervid opposition to the idolatry of the Greeks and Romans was of Early Christianity and later Islam, as evidenced by the widespread desecration and defacement of ancient Greek and Roman sculptures that have survived into the modern era.

Abrahamic religions

Judaism

thumb|alt=This is an image of a copy of the 1675 Ten Commandments, at the Amsterdam Esnoga synagogue, produced on parchment in 1768 by [[Jekuthiel Sofer, a prolific Jewish scribe in Amsterdam. It has Hebrew language writing in two columns separated between, and surrounded by, ornate flowery patterns.|A 1768 synagogue parchment with the Ten Commandments by Jekuthiel Sofer. Among other things, it prohibits idolatry.]]

thumb|Moses Indignant at the Golden Calf, painting by [[William Blake, 1799–1800]]

Judaism prohibits any form of idolatry even if they are used to worship the one God of Judaism as occurred during the sin of the golden calf. According to the second commandment of the decalogue, Thou shalt not make unto thee any graven image. The worship of foreign gods in any form or through icons is not allowed.

Many Jewish scholars such as Rabbi Saadia Gaon, Rabbi Bahya ibn Paquda, and Rabbi Yehuda Halevi have elaborated on the issues of idolatry. One of the oft-cited discussions is the commentary of Rabbi Moshe ben Maimon (Maimonides) on idolatry.

The commandments in the Hebrew Bible against idolatry forbade the practices and gods of ancient Akkad, Mesopotamia, and Egypt. The Hebrew Bible states that God has no shape or form, is utterly incomparable, is everywhere and cannot be represented in a physical form of an idol.

Biblical scholars have historically focused on the textual evidence to construct the history of idolatry in Judaism, a scholarship that post-modern scholars have increasingly begun deconstructing. Nonetheless, these sorts of evidence may be simply descriptive of Ancient Israelite practices in some—possibly deviant—circles, but cannot tell us anything about the mainstream religion of the Bible which proscribes idolatry.

The history of Jewish religious practice has included idols and figurines made of ivory, terracotta, faience and seals. As more material evidence emerged, one proposal has been that Judaism oscillated between idolatry and iconoclasm. However, the dating of the objects and texts suggest that the two theologies and liturgical practices existed simultaneously. The claimed rejection of idolatry because of monotheism found in Jewish literature and therefore in biblical Christian literature, states Janowitz, has created an unreal abstraction and flawed construction of the actual history. Every religion has some objects that represent the divine and stand for something in the mind of the faithful, and Judaism too has had its holy objects and symbols such as Torah scrolls and holy books, Tefillin, the Menorah, mezuzah and many more.

Christianity

thumb|[[Benedict of Nursia|St. Benedict destroying a pagan idol, by Juan Rizi (1600–1681)]]Ideas on idolatry in Christianity are based on the first of Ten Commandments.

This is expressed in the Bible in Exodus 20:3, Matthew 4:10, Luke 4:8 and elsewhere, e.g.:

The Christian view of idolatry may generally be divided into two general categories: the Catholic and Eastern Orthodox view which accepts the use of religious images, and the views of many Protestant churches that considerably restrict their use. However, many Protestants have used the image of the cross as a symbol.

Catholicism

The Catholic Church and the Orthodox Church have traditionally defended the use of icons. The debate on what images signify and whether reverence with the help of icons in church is equivalent to idolatry has lasted for many centuries, particularly from the 7th century until the Reformation in the 16th century. These debates have supported the inclusion of icons of Jesus Christ, the Virgin Mary, and the Apostles, the iconography expressed in stained glass, regional saints and other symbols of Christian faith. It has also supported the practices such as the Catholic mass, burning of candles before pictures, Christmas decorations and celebrations, and festive or memorial processions with statues of religious significance to Christianity.

St. John of Damascus, in his "On the Divine Image", defended the use of icons and images, in direct response to the Byzantine iconoclasm that began widespread destruction of religious images in the 8th century, with support from emperor Leo III and continued by his successor Constantine V during a period of religious war with the invading Umayyads. John of Damascus wrote, "I venture to draw an image of the invisible God, not as invisible, but as having become visible for our sakes through flesh and blood", adding that images are expressions "for remembrance either of wonder, or an honor, or dishonor, or good, or evil" and that a book is also a written image in another form. He defended the religious use of images based on the Christian doctrine of Jesus as an incarnation.

St. John the Evangelist cited John 1:14, stating that "the Word became flesh" indicates that the invisible God became visible, that God's glory manifested in God's one and only Son as Jesus Christ, and therefore God chose to make the invisible into a visible form, the spiritual incarnated into the material form.

thumb|right|[[Pope Pius V praying with a crucifix, painting by August Kraus]]

The early defense of images included exegesis of Old and New Testament. Evidence for the use of religious images is found in Early Christian art and documentary records. For example, the veneration of the tombs and statues of martyrs was common among early Christian communities. In 397 St. Augustine of Hippo, in his Confessions 6.2.2, tells the story of his mother making offerings for the tombs of martyrs and the oratories built in the memory of the saints.