But don't evangelists already have a hard on for geology? Or at least for the principles of geology which imply an ancient earth? The grand canyon as the product of the flood, etc....
Can't say I've heard that one before.
Oh, I have! From a teacher in a public school--even, a teacher I respected.
Some qualifiers: She was only recently promoted to full time teacher, from a substitute. She taught journalism, not any kind of science. She didn't preach her Creationism using her position as teacher.
She argued with me, I think, because she knew I wasn't someone she could just bully on the subject; she knew I'd argue back. I'd already spent some years engaging with Creationism in the context of human evolution--which I'm afraid, DValdron, rather underscores the naysayers here; the status of human beings is much more visceral and much more relevant to the core of religious teaching. What we are does have some bearing on how we should live after all.
It was precisely the Grand Canyon that provoked all this discussion; I'd seen it on a family trip over the previous summer and she and a fellow student were going on about the "appropriate" verses in Genesis...
Does it help anyone visualize this if I point out the high school was on the Gulf Coast of Florida, in the far western panhandle part that has more cultural affinity to Deep South states like Alabama (there was in fact a sort of secession movement to spilt west Florida off and join it to Alabama, led to no notable result by a disgruntled politician...

) and that this was 1982?
Half a decade later I had a sort of religious experience of my own, looking down on the same sort of badlands the Canyon lies in from an airplane, and seeing at a glance as it were how it would take millions of years of chaotic but gradual events to get the sort of layer cake I was seeing.
Just to note--Yep, America is nutty enough to have lots of YEC types. Even decent people otherwise quite respectable. And we have been for generations.
Even for their denialism to reach the realm of dead geology, as opposed to evolution. But their passion is centered more on the latter than the former, even though historically it was geology, not biology, that first challenged the creationist world-view and first demanded an uncanonical assumption of Deep Time.
There's not a damn thing in the Bible stating that the Earth is flat, and not even any of the major Young Earth Creationists claim it to be flat.
There certainly are Flat-Earthers, though having never engaged with one I don't know how much they take themselves seriously.
As for the Bible--I'm no Biblical scholar, but I'm pretty sure that while the Bible never says "by the way, the Earth is flat and has a dome over it and has four corners," there is lots of language in it that simply assumes this is the case, as a matter of plain common sense. It's all very well to gloss over that and say it has no bearing on the spiritual or even human-historical narrative and makes no difference. Being raised Roman Catholic I assumed that was the case. Nevertheless, at least here in the fundamentalist-haunted United States, one does meet people who are deeply committed to the idea of biblical literalism, and if the clear, plain interpretation of the text is, the world is flat and the sky is a firmament with a lot of water held up behind it and the sun moves across the sky, not the Earth turning under the distant sun...I don't know how they square it.
My late grandfather was not a Protestant fundie, being Roman Catholic (a convert though) although he was quite the font of right-wing crank views. He did have some odd remark he tried to impress me with from time to time though, something about NASA having to account for the day God stopped the sun's progress across the sky to allow Joshua to win some battle. I've never understood just how an alleged stoppage of the Earth's rotation some 3000 years ago would have any bearing on the computations the Apollo program had to make in the 1960s; I'm afraid I didn't get into it that much and now I can't ask him where the heck he was getting that from.
Just saying--the world view of Genesis, in the sense of cosmology and geology and geography, is quite clearly alien to the worldview of anyone familiar with the fact the Earth is a globe that spins and orbits the Sun. And although most people, even religious fanatics, don't engage that contradiction, some do.