Intelligent Design
A.K.A. Creationism in a clown suit.[1]
Definition
Intelligent Design claims to be a scientific alternative to Evolution for explaining how life came be on Earth. In reality, it is nothing more than a dishonest attempt to evade separation of church and state laws in the United States after Creationism was ruled a violation of them. Several creationist books suddenly changed their terminology soon after this ruling. "Creation" changed to "ID", "God" changed to "intelligent designer", etc.
Content
ID proposes that life is too complex to have evolved naturally. Therefore some higher power must have intervened to specifically create those features that are argued to be "irreducibly complex” or in other words, it is a colossal [[Logic Fallacies in Debating|appeal to ignorance fallacy].
The primary argument is that taking the structure apart causes it to not function. However, this claim is misleading at best. As has been proven, the components of the structure don't perform that particular function but they do often perform other functions.