The Intelligent Design movement is not something totally new. In the late 18th and early 19th centuries there was what was called the Argument from Design, arguing that biological organisms had to be designed by an intelligence. The seminal work was published by William Paley in 1802 entitled Natural Theology:. But it is the subtitle that is revealing: or, Evidences of the Existence and Attributes of the Deity, Collected from the Appearances of Nature. Paley was the guy who introduced the famous "watch on the heath" argument. He stated that biological organisms were so much more complex than a watch and fulfilled obvious tasks, therefore they too were manufactured artifacts just like a watch.
Paley wasn't formulating a scientific theory, however, as this passage shows:
"There cannot be design without a designer; contrivance, without a contriver; order, without choice; arrangement, without any thing capable of arranging; subserviency and relation to a purpose, without that which could intend a purpose; means suitable to an end, and executing their office in accomplishing that end, without the end ever having been contemplated, or the means accommodated to it. [emphasis mine] Arrangement, disposition of parts, subserviency of means to an end, relation of instruments to a use, imply the presence of intelligence and mind. No one, therefore, can rationally believe that the insensible, inanimate watch, from which the watch before us issued, was the proper cause of the mechanism we so much admire in it --could be truly said to have constructed the instrument, disposed its parts, assigned their office, determined their order, action, and mutual dependency, combined their several motions into one result, and that also a result connected with the utilities of other beings. ...A second examination presents us with a new discovery. The watch is found, in the course of its movement, to produce another watch similar to itself; only so, but we perceive in it a system or organization separately calculated for that purpose. What effect would this discovery have or ought it to have, upon our former inference? What, as hath already been said, but to increase beyond measure our admiration of the skill which had been employed in the formation of such a machine? Or shall it, instead of this, all at once turn us round to an opposite conclusion, namely, that no art or skill whatever has been concerned in the business, although all other evidences of art and skill remain as they were, and this last and supreme piece of art be now added to the rest? Can this be maintained without absurdity? Yet this is atheism.
Application of the Argument
This is atheism; for every indication of contrivance, every manifestation of design which existed in the watch, exists in the works of nature, with the difference on the side of nature of being greater and more, and that in a degree which exceeds all computation. I mean, that the contrivances of nature surpass the contrivances of art, in the complexity, subtelty, and curiosity of the mechanism; and still more, if possible, do they go beyond them in number and variety; yet, in a multitude of cases, are not less evidently mechanical, not less evidently contrivances, not less evidently accommodated to their end or suited to their office, than are the most perfect productions of human ingenuity."
Paley was constructing an argument against atheism and for theism, not a scientific theory.
Darwin read Paley while at Cambridge and it had a great effect on him. Darwin knew that, in order to answer Paley's question about the source of the designs in biological organisms, he had to find a mechanism to get design. And he did: natural selection.
Now, what IDers do is exactly what Paley did: look at the organisms themselves, in isolation, and conclude that their complexity and adaptation to a purpose alone justified the inference of intelligent design and manufacture.
But is that criteria true? Is the object itself the only thing we base our inference of design upon? If you walk through a woods and come across a straight oak stick and a bronze-headed spear with an oak shaft, you infer that the stick is not designed but that the spear is. Why? How do you do that? If you answer that you know about manufacturing processes to get a spear, consider Spielberg's new show Taken where humans have an alien artifact. They don't know how it is made or what it does, but they are very confident in their inference that this is a manufactured artifact. Why?
When you puzzle this out, you will find one of the major flaws of ID.
Paley wasn't formulating a scientific theory, however, as this passage shows:
"There cannot be design without a designer; contrivance, without a contriver; order, without choice; arrangement, without any thing capable of arranging; subserviency and relation to a purpose, without that which could intend a purpose; means suitable to an end, and executing their office in accomplishing that end, without the end ever having been contemplated, or the means accommodated to it. [emphasis mine] Arrangement, disposition of parts, subserviency of means to an end, relation of instruments to a use, imply the presence of intelligence and mind. No one, therefore, can rationally believe that the insensible, inanimate watch, from which the watch before us issued, was the proper cause of the mechanism we so much admire in it --could be truly said to have constructed the instrument, disposed its parts, assigned their office, determined their order, action, and mutual dependency, combined their several motions into one result, and that also a result connected with the utilities of other beings. ...A second examination presents us with a new discovery. The watch is found, in the course of its movement, to produce another watch similar to itself; only so, but we perceive in it a system or organization separately calculated for that purpose. What effect would this discovery have or ought it to have, upon our former inference? What, as hath already been said, but to increase beyond measure our admiration of the skill which had been employed in the formation of such a machine? Or shall it, instead of this, all at once turn us round to an opposite conclusion, namely, that no art or skill whatever has been concerned in the business, although all other evidences of art and skill remain as they were, and this last and supreme piece of art be now added to the rest? Can this be maintained without absurdity? Yet this is atheism.
Application of the Argument
This is atheism; for every indication of contrivance, every manifestation of design which existed in the watch, exists in the works of nature, with the difference on the side of nature of being greater and more, and that in a degree which exceeds all computation. I mean, that the contrivances of nature surpass the contrivances of art, in the complexity, subtelty, and curiosity of the mechanism; and still more, if possible, do they go beyond them in number and variety; yet, in a multitude of cases, are not less evidently mechanical, not less evidently contrivances, not less evidently accommodated to their end or suited to their office, than are the most perfect productions of human ingenuity."
Paley was constructing an argument against atheism and for theism, not a scientific theory.
Darwin read Paley while at Cambridge and it had a great effect on him. Darwin knew that, in order to answer Paley's question about the source of the designs in biological organisms, he had to find a mechanism to get design. And he did: natural selection.
Now, what IDers do is exactly what Paley did: look at the organisms themselves, in isolation, and conclude that their complexity and adaptation to a purpose alone justified the inference of intelligent design and manufacture.
But is that criteria true? Is the object itself the only thing we base our inference of design upon? If you walk through a woods and come across a straight oak stick and a bronze-headed spear with an oak shaft, you infer that the stick is not designed but that the spear is. Why? How do you do that? If you answer that you know about manufacturing processes to get a spear, consider Spielberg's new show Taken where humans have an alien artifact. They don't know how it is made or what it does, but they are very confident in their inference that this is a manufactured artifact. Why?
When you puzzle this out, you will find one of the major flaws of ID.