Abstract
Order and change in nature have been for a long time understood in philosophy and theology as founded in divine reason. In the neo-Darwinist theory of evolution, their explanation is reduced to material change without reason. Molecular biologists like M. Behe and W. Demski argue that any reductionist explanation of living beings must be wrong. The evolution of irreducible complex structures is impossible on the basis of random variation and natural selection alone, and must be the result of intelligent design. The article argues that ID-theory, unlike Biblical Creationism, is a challenge for neo-Darwinism and for modern theology as well—for, unlike the Roman magisterium, many Catholic theologians try to harmonize reductive explanation with the notion of creation.