Epistemology. I know how much trust has to be put into the science that can look at rocks and claim that there is proof that there was a supercontinent that broke up (not that they deny Panagaea, if it can be fitted into the Flood scenario), and there was a huge sea in the middle of America. I have seen a few vids explaining some of the clues and where Archon rocks can still be found. I have seen pretty convincing geology of old mountain ranges revealed where newer mountain ranges have eroded away. I have seen so many rolled over strata that talk of ancient pressure over millions of years, not a year long flood that did 100 million years of geology and biological evolution in one go. It just isn't reasonable.
I've done the grand canyon, the whale morphology. There is compelling evidence for deep time geology, and evolution rather than creation and no Flood. The apologetics come back to bite them, like shells on mountains. They are fossil sea floors turned into strata and pushed up as mountains like any other strata. The response is to look for excuses - say the Genesis sea floor got pushed up as mountains to make the water appear to go down. But I thought they were there to support the hydroplate lid. They have got to make their theory coherent, not this ad hoc stuff.
There's a possible funny clue to what Creationism is having to do - because the evidence for deep time geology and evolution is so good, they have to make Creationism fit it, but speed it up to a a few hundred years or so. A funny possible clue was Pakicetus on Ken Ham's Ark. Clever. The Cetan sequence is compelling evidence of speciation. So Pakecetus is perhaps on the Ark as a Baryma - a 'Kind' from which all the whales would evolve in the time between the Flood and the pyramids. I suppose that's the idea - to make speciation a feature of the super -evolution after the Ark and before Egypt.
It's been a problem - where are the Baryma - the basic Kinds - in the fossil records? (1) Well it may be that Pakicetus may be made to look like Whale -kind, given a couple of hundred years for macro evolution to a whale. We've been here before, though with less craftiness, ingenuity or expense: 7 days as the 13+ billion years of the universe divided into 7. But that's a terrible cropper as the Bible says day and night, morning and evening not 2 billion yeas call it a 'day'. That's not just science denial but Bible denial, but there... if the Bible disagrees with the claims of he Believer, the Bible itself has to be dismissed.
But here's the gamble

They don't read the Bible, or if they do, and it doesn't say what they want (see Slavery), they ignore it and suppose we don't read it either. But half of us to used to be believers, and so know what's there. The battle is not for the best case - that's been long done - but for the media. Whoever controls media, education and input, they are the ideology that will be state ideology.
Didn't we see some poster arguing for teach the controversy? Where? In the science discussion? In Accademia? No, in the classroom where they can indoctrinate the kids. They know that if you control education, half the job is done.
(1) twitchy creationist fingers reach for the Magic Wand again

"There were only a few - what Noah needed to start the animals over again.". They can have that one for free.