"Chapter 1: Darwin’s Nemesis
Darwin’s theory says that all life is related through universal common ancestry by a process of descent with modification. Descent with modification is brought about by random variations acted upon by natural selection. Change would necessarily be gradual. Natural selection would preserve all adaptive variations and reject harmful ones. Over geological deep time, the accumulation of these beneficial variations would eventually lead to new species and body plans. Hence Darwin envisioned the history of life as a tree with the first living thing at the base of the trunk of the tree.
Darwin was aware of the fossil record in the Cambrian (called the Silurian in his day) and admitted that it was a mystery not readily explained by his theory. Louis Agassiz, a contemporary of Darwin and a Harvard-trained paleontologist, said that the fossil record did not fit Darwin’s theory, especially the Cambrian. The Cambrian is full of well preserved fossils of many very complex and different animals such as brachiopods and trilobites.4
Darwin’s theory requires much time to bring about large changes. But the Cambrian records many disparate animals appearing suddenly without precursors over a relatively brief period of time, something Darwin’s theory could not readily explain. Agassiz thought the fossil record refuted Darwin’s theory. Other paleontologists pointed out that the general character of the fossil record—abrupt appearance, stasis, extinction—did not fit Darwin’s theory.
Darwin said future research would vindicate his theory, but Agassiz said that the record already contained fossils of soft-bodied animals without hard body parts. Agassiz said the missing intermediates and precursors Darwin’s theory predicted were not an artifact of the fossil record but were truly missing.
Nevertheless, many of Darwin’s other contemporaries embraced his theory and soon it was widely accepted. Science was shifting from “idealism,” which held that animals were the product of ideas and a mind, to methodological naturalism, which holds that everything must have a natural cause."
That last paragraph reveals evolutionary science to hinge on vacillating conjecture. That's why evolutionary scientists argue so much among themselves!
Then your best argument for creationism is the paucity of fossils from the Cambrian explosion?
I notice that when phrases like "a relatively brief period of time" appear, we don't usually see numbers. Are you aware that we are talking about 20-25 million years, and that it was a period immediately following a critical breakthrough in biological evolution - the advent of multicellular, metazoan animals? It's not surprising at all that these creatures experienced an adaptive radiation to exploit all existing niches. They wouldn't have had much competition from unicellular life forms or colonies. This is exactly what the concept of punctuated equilibrium predicts - periods of relative stasis punctuated by periods of relatively rapid evolution.
Furthermore, none of this supports the biblical view, which has a god creating one single, special species made in that god's image and possessing a soul. These creatures were all low intelligence marine life. Our closest relatives at that time looked like this guy, Haikouichthys:
If this is the product of an intelligent designer, it wouldn't be the god of the Christian Bible, would it? If the ID ever find the evidence they're looking for, it will overturn their religion.
I doubt that anybody is listening to the creationists any more, and probably won't until they produce positive, physical evidence of creation, and I can't imagine what that would be. Arguments without demonstrable evidence aren't enough.
I doubt that anybody will want to spend much effort elucidating a putative evolutionary pathway to refute future claims of irreducible complexity. The creationists have demonstrated that they're only guessing, and guessing badly.
It's clear that they want creationism to be true, and we know what happens when we investigate reality with a confirmation bias. We see what we want to see.
Science has to be done impartially, with a willingness to go wherever reason applied to the existing evidence takes us. Good science does everything in its power to eliminate investigator bias. Clinical trials are prospective, randomized, use control groups and are double blinded (neither investigator or subject knows who is getting treatment and who is getting placebo), then peer reviewed and replicated when feasible. Everything possible is done by colleagues to refute any new finding.
The creationists are doing the opposite. They're starting with a premise and trying to make it look like a sound conclusion. They cannot be expected to try to refute one another. They can't be expected to do what the non-creationists had to do for them regarding their claims of irreducible complexity. The creationists have no desire to refute one another.