What makes evolution the only science theory that concerns Christians who argue for creationism? There are other scientific theories with less proof than evolution which they seem to accept without question. With evolution they look for any insignificant fact to inflate into an argument knowing there is no proof for creationism. What is the great fear?
This is a question to which I have never had a clear answer.
I suspect in part it must be to do with their rather simple view of the connected doctrines of Original Sin and Redemption, but I have never got a creationist yet to give me a straight answer. The literalist idea is that death entered the world with the first sin of Adam and Eve in the Garden of Eden. So obviously you can't have fossils of dead creatures from before the time Man arrived. The idea is that Christ's sacrifice undid the damage and opened the way to eternal life once more.
To accommodate this theology, the Young Earth Creationist has to chuck out not only evolution but also the whole of geology and geophysics, given its abundant evidence for rocks far older than when mankind appeared.
The Old Earth Creationist is more intriguing. He or she has managed to accept the age of the Earth and physical death before man, but still cannot abide the idea that life could have arisen without a supernatural miracle, or miracles. Why, I do not really understand. Some of them also espouse such ideas as the Fine Tuning Argument about the cosmos, for example, so it is not just life, apparently. It may simply be a desire to see, unambiguously, the hand of God in the physical world. But this is speculation on my part.
In the case of ID of course, there is another Machiavellian factor at work. As their own (leaked) Wedge Document makes clear, ID was invented by a lawyer (Phillip Johnson) as a ruse to squeeze God into school science teaching in the USA.
Wedge strategy - Wikipedia
So ID is basically a social engineering project, masquerading as science.
While YECs and OECs may be honest, if misguided, people, the cdesign proponentsist (or ID advocate
cdesign proponentsists - RationalWiki) is a participant in a scam. This scam tries to create a political climate in which local politicians can be hoodwinked or coerced into altering State educational guidance, to permit God to be taught as part of science - and hence, as the Religious Right sees it, to put God back into society (as if God had ever left, especially in the USA). So for IDers, they have their own disingenuous motives that are nothing to do with specific beliefs at all.