Intelligent design (ID) is an anti-evolution belief that asserts that naturalistic explanations of some biological entities are not possible and such entities can only be explained by intelligent causes. Essentially that many organisms, including humans and animals, are too complex in nature to have come to be by chance mutation.
The multiple parts of complex, interlocking biological systems do not evolve as individual parts. They evolve together, as systems that are gradually expanded, enlarged, and adapted to new purposes.The assertation that the nature and complexity of the design of man would leave no room for randomness or error seem to disintegrate when you consider the presence of the appendix, and the relatively poor designs of the spine, birth canal, and the prostate. (Summation from the Skeptic, multiple contributors)
"To reach this page you had to acknowledge that immaterial, universal, unchanging laws of logic, mathematics, science, and absolute morality exist. Universal, immaterial, unchanging laws are necessary for rational thinking to be possible. Universal, immaterial, unchanging laws cannot be accounted for if the universe was random or only material in nature...Only in a universe governed by God can universal, immaterial, unchanging laws exist. Only in a universe governed by God can rational thinking be possible. We use rational thinking to prove things."
*Minor edit on April 1, 2008 to fix formatting