To establish evolutionary interrelatedness invariably requires exhibiting similarities between organisms. Within Darwinism, there's only one way to connect such similarities, and that's through descent with modification driven by the Darwinian mechanism. But within a design-theoretic framework, this possibility, though not precluded, is also not the only game in town. It's possible for descent with modification instead to be driven by telic processes inherent in nature (and thus by a form of design). Alternatively, it's possible that the similarities are not due to descent at all but result from a similarity of conception, just as designed objects like your TV, radio, and computer share common components because designers frequently recycle ideas and parts. Teasing apart the effects of intelligent and natural causation is one of the key questions confronting a design-theoretic research program. Unlike Darwinism, therefore, intelligent design has no immediate and easy answer to the question of common descent.Darwinists necessarily see this as a bad thing and as a regression to ignorance. From the design theorists' perspective, however, frank admissions of ignorance are much to be preferred to overconfident claims to knowledge that in the end cannot be adequately justified. Despite advertisements to the contrary, science is not a juggernaut that relentlessly pushes back the frontiers of knowledge. Rather, science is an interconnected web of theoretical and factual claims about the world that are constantly being revised and for which changes in one portion of the web can induce radical changes in another. In particular, science regularly confronts the problem of having to retract claims that it once confidently asserted.

~ William A. Dembski

Christians must show that misery fits the good for heaven, while happiness prepares the bad for hell; that the wicked get all their good things in this life, and the good all their evil; that in this world God punishes the people he loves, and in the next, the ones he hates; that happiness makes us bad here, but not in heaven; that pain makes us good here, but not in hell. No matter how absurd these things may appear to the carnal mind, they must be preached and they must be believed. If they were reasonable, there would be no virtue in believing. Even the publicans and sinners believe reasonable things. To believe without evidence, or in spite of it, is accounted as righteousness to the sincere and humble christian.In short, Christians are expected to denounce all pleasant paths and rustling trees, to curse the grass and flowers, and glorify the dust and weeds. They are expected to malign the wicked people in the green and happy fields, who sit and laugh beside the gurgling springs or climb the hills and wander as they will. They are expected to point out the dangers of freedom, the safety of implicit obedience, and to show the wickedness of philosophy, the goodness of faith, the immorality of science and the purity of ignorance.

~ Robert G. Ingersoll

The real difference is this: the Christian says that he has knowledge; the Agnostic admits that he has none; and yet the Christian accuses the Agnostic of arrogance, and asks him how he has the impudence to admit the limitations of his mind. To the Agnostic every fact is a torch, and by this light, and this light only, he walks.The Agnostic knows that the testimony of man is not sufficient to establish what is known as the miraculous. We would not believe to-day the testimony of millions to the effect that the dead had been raised. The church itself would be the first to attack such testimony. If we cannot believe those whom we know, why should we believe witnesses who have been dead thousands of years, and about whom we know nothing?The Agnostic takes the ground that human experience is the basis of morality. Consequently, it is of no importance who wrote the gospels, or who vouched or vouches for the genuineness of the miracles. In his scheme of life these things are utterly unimportant. He is satisfied that “the miraculous” is the impossible. He knows that the witnesses were wholly incapable of examining the questions involved, that credulity had possession of their minds, that 'the miraculous' was expected, that it was their daily food.

~ Robert G. Ingersoll