Some people believe in a strict interpretation of Genesis. Some even believe that dinosaurs and humans roamed the earth at the same time. Other cultures believed that a giant turtle created the land of Earth. One belief is that a woman who fell from the sky was behind the creation of the Earth. Others believe that a jumbled mass of elements at the beginning of time was in the shape of an egg. Similarly, the ancient Greeks believed a golden egg hatched and gave birth to the sky and the Earth. So, why not teach all of these approaches — along with intelligent design — in the same class? And call that class, "comparative religions" or "creation myths." Just don't call that class "science."
Those pushing the intelligent design alternative to evolution are taking advantage of the word "theory" having several definitions. The reasoning goes that a theory is not a fact but just conjecture, so alternative conjectures should be taught as well. Unfortunately for those who have embraced intelligent design, there is a very specific definition for a scientific theory such as the theory of evolution, and it's not conjecture.