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Intelligent design (ID) is a pseudoscientific argument for the existence of God, presented by its proponents as "an evidence-based scientific theory about life's origins". Proponents claim that "certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as natural selection." ID is a form of creationism that lacks empirical support and offers no testable or tenable hypotheses, and is therefore not science. The leading proponents of ID are associated with the Discovery Institute, a Christian, politically conservative think tank based in the United States.

Though the phrase intelligent design had featured previously in theological discussions of the argument from design, its first publication in its present use as an alternative term for creationism was in Of Pandas and People, a 1989 creationist textbook intended for high school biology classes. The term was substituted into drafts of the book, directly replacing references to creation science and creationism, after the 1987 Supreme Court's Edwards v. Aguillard decision barred the teaching of creation science in public schools on constitutional grounds. From the mid-1990s, the intelligent design movement (IDM), supported by the Discovery Institute, advocated inclusion of intelligent design in public school biology curricula. This led to the 2005 Kitzmiller v. Dover Area School District trial, which found that intelligent design was not science, that it "cannot uncouple itself from its creationist, and thus religious, antecedents," and that the public school district's promotion of it therefore violated the Establishment Clause of the First Amendment to the United States Constitution.

ID presents two main arguments against evolutionary explanations: irreducible complexity and specified complexity, asserting that certain biological and informational features of living things are too complex to be the result of natural selection. Detailed scientific examination has rebutted several examples for which evolutionary explanations are claimed to be impossible.

ID seeks to challenge the methodological naturalism inherent in modern science, though proponents concede that they have yet to produce a scientific theory. As a positive argument against evolution, ID proposes an analogy between natural systems and human artifacts, a version of the theological argument from design for the existence of God. ID proponents then conclude by analogy that the complex features, as defined by ID, are evidence of design. Critics of ID find a false dichotomy in the premise that evidence against evolution constitutes evidence for design.

History

Origin of the concept

In 1910, evolution was not a topic of major religious controversy in America, but in the 1920s, the Fundamentalist–Modernist Controversy in theology resulted in Fundamentalist Christian opposition to teaching evolution, and the origins of modern creationism. Teaching of evolution was effectively suspended in U.S. public schools until the 1960s, and when evolution was then reintroduced into the curriculum, there was a series of court cases in which attempts were made to get creationism taught alongside evolution in science classes. Young Earth creationists (YEC) promoted creation science as "an alternative scientific explanation of the world in which we live". This frequently invoked the argument from design to explain complexity in nature as demonstrating the existence of God.

The argument from design, also known as the teleological argument or "argument from intelligent design", has been advanced in theology for centuries. It can be summarised briefly as "Wherever complex design exists, there must have been a designer; nature is complex; therefore nature must have had an intelligent designer." Thomas Aquinas presented it in his fifth proof of God's existence as a syllogism. In 1802, William Paley's Natural Theology presented examples of intricate purpose in organisms. His version of the watchmaker analogy argued that, in the same way that a watch has evidently been designed by a craftsman, complexity and adaptation seen in nature must have been designed, and the perfection and diversity of these designs shows the designer to be omnipotent, the Christian God. Like creation science, intelligent design centers on Paley's religious argument from design, but while Paley's natural theology was open to deistic design through God-given laws, intelligent design seeks scientific confirmation of repeated miraculous interventions in the history of life. Creation science prefigured the intelligent design arguments of irreducible complexity, even featuring the bacterial flagellum. In the United States, attempts to introduce creation science in schools led to court rulings that it is religious in nature, and thus cannot be taught in public school science classrooms. Intelligent design is also presented as science, and shares other arguments with creation science but avoids literal Biblical references to such things as the Flood story from the Book of Genesis or using Bible verses to age the Earth.

Barbara Forrest writes that the intelligent design movement began in 1984 with the book The Mystery of Life's Origin: Reassessing Current Theories, co-written by creationist Charles B. Thaxton, a chemist, with two other authors, and published by Jon A. Buell's Foundation for Thought and Ethics.

In March 1986, Stephen C. Meyer published a review of the book, discussing how information theory could suggest that messages transmitted by DNA in the cell show "specified complexity" specified by intelligence, and must have originated with an intelligent agent. He also argued that science is based upon "foundational assumptions" of naturalism which were as much a matter of faith as those of "creation theory". In November of that year, Thaxton described his reasoning as a more sophisticated form of Paley's argument from design. At the "Sources of Information Content in DNA" conference which Thaxton held in 1988, he said that his intelligent cause view was compatible with both metaphysical naturalism and supernaturalism.

Intelligent design avoids identifying or naming the intelligent designer—it merely states that one (or more) must exist—but leaders of the movement have said the designer is the Christian God. Whether this lack of specificity about the designer's identity in public discussions is a genuine feature of the concept, or just a posture taken to avoid alienating those who would separate religion from the teaching of science, has been a matter of great debate between supporters and critics of intelligent design. The Kitzmiller v. Dover Area School District court ruling held the latter to be the case.

Origin of the term

Since the Middle Ages, discussion of the religious "argument from design" or "teleological argument" in theology, with its concept of "intelligent design", has persistently referred to the theistic Creator God. Although ID proponents chose this provocative label for their proposed alternative to evolutionary explanations, they have de-emphasized their religious antecedents and denied that ID is natural theology, while still presenting ID as supporting the argument for the existence of God.

While intelligent design proponents have pointed out past examples of the phrase intelligent design that they said were not creationist and faith-based, they have failed to show that these usages had any influence on those who introduced the label in the intelligent design movement.

Variations on the phrase appeared in Young Earth creationist publications: a 1967 book co-written by Percival Davis referred to "design according to which basic organisms were created". In 1970, A. E. Wilder-Smith published The Creation of Life: A Cybernetic Approach to Evolution which defended Paley's design argument with computer calculations of the improbability of genetic sequences, which he said could not be explained by evolution but required "the abhorred necessity of divine intelligent activity behind nature", and that "the same problem would be expected to beset the relationship between the designer behind nature and the intelligently designed part of nature known as man." In a 1984 article as well as in his affidavit to Edwards v. Aguillard, Dean H. Kenyon defended creation science by stating that "biomolecular systems require intelligent design and engineering know-how", citing Wilder-Smith. Creationist Richard B. Bliss used the phrase "creative design" in Origins: Two Models: Evolution, Creation (1976), and in Origins: Creation or Evolution (1988) wrote that "while evolutionists are trying to find non-intelligent ways for life to occur, the creationist insists that an intelligent design must have been there in the first place." The first systematic use of the term, defined in a glossary and claimed to be other than creationism, was in Of Pandas and People, co-authored by Davis and Kenyon.

Of Pandas and People