Intelligent design is a creationist religious argument for the existence of God, presented by its proponents as "an evidence-based scientific theory about life's origins" but found to be pseudoscience. 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." Educators, philosophers, and the scientific community have demonstrated that ID is a religious argument, a form of creationism which lacks empirical support and offers no testable or tenable hypotheses. Proponents argue that it is "an evidence-based scientific theory about life's origins" that challenges the methodological naturalism inherent in modern science, while conceding that they have yet to produce a scientific theory. The leading proponents of ID are associated with the Discovery Institute, a politically conservative think tank based in the United States. Although they state that ID is not creationism and deliberately avoid assigning a personality to the designer, many of these proponents express belief that the designer is the Christian deity.
ID presents negative arguments against evolutionary explanations, and its positive argument is an analogy between natural systems and human artifacts, a version of the theological argument from design for the existence of God. Both irreducible complexity and specified complexity present detailed negative assertions that certain features (biological and informational, respectively) are too complex to be the result of natural processes. Proponents then conclude by analogy that these features are evidence of design. Detailed scientific examination has rebutted the claims that evolutionary explanations are inadequate, and this premise of intelligent design—that evidence against evolution constitutes evidence for design—has been criticized as a false dichotomy.