That is not a law of science. That is a law of ingrained stupidity. It was one of the innumberable proofs of god supplied by 12th century clerics with too much time on their hands. It also a gross and obvious logical fallacy called the Fallacy of the Excluded Middle. Apparent design could be a demonstration of coping mechanisms seeking to maintain linear equilibrium in a slowly changing environment. That is not proof that the coping mechanism was God.
In the above you perhaps have demonstrated what the dispute between religion (and ID) and evolution is. Evolution says that the changes are due to natural selection, religion (and ID) say they are due to intelligent Creation. Both views propose an unseen agent being the source of biological change. However, the problem with natural selection as the source of change is that selection does not create anything it only destroys.