The rest of Genesis contain certain details that can not be literal or figurjative. The first is the order of creation, specifically the creation of the sun and moon after the Earth. This brings up another point that I think a believer should do when stating that a passage is literal: Explaining what to do with elements of the narrative that seem not to work in either a literal or figurative reading.
Again, these terms are fairly limited.
Genesis 1 is a theological account of creation–I have no problem calling it myth, but many other Christians do. It’s pretty clearly a critique of Babylonian creation stories. I think that even when you say “figurative,” you imagine that there must be something that the story is telling us about the order in which the universe was created.
And maybe there is. I’m open to that possibility, but as you note there are some difficulties with the idea.
The second Genesis 1 detail that is troublesome is the description of a so-called firmament and of waters above the firmament.
Troublesome to whom and why?
I’m ok with a non-literal interpretation of days, but again there needs to be an explanation as to why what is said to be created third (the Earth) is incorrectly listed as being created before what was created fourth (the sun and moon). What are the non-literal explanations for the words “third” and “fourth”?
And that’s why the whole “literal/nonliteral” discussion is unhelpful. Why do you decree that Christians must believe that the text is telling us something authoritative about the details of cosmology in the first place?
If someone says “Catholics don’t read the Bible literally”, but won’t go further in explaining that position then the believer responding hasn’t given a reason to use an alternate reading of that passage. All I ask in such situations is to give a reasoned explanation for any reading.
I’m happy to do that, ad nauseam

. And I agree that just saying “the reading isn’t literal” is inadequate. As, on the other hand, is saying “I’m just reading the text literally, so why aren’t you doing the same?”
What with the word literal pretty much having a singular meaning (the four definitions I quoted were all in the same ballpark) I have to state that I do have very solid grounds for assuming such things.
Actually, even the first meaning you cite has at least three quite distinct meanings subsumed under it. The “primary” meaning may or may not be the same thing as the “strict” meaning, and the “primary” meaning may well be figurative or metaphorical.
And try applying this to Scripture, and you wind up in a hopeless morass.
Another set of difficulties that we haven’t addressed explicitly, by the way, is the difference between the “literal” meaning of a word or phrase and of a sentence or longer passage, and the further distinction between the question of whether the language is literal and (to use N. T. Wright’s terminology) whether the referent is abstract or concrete.
For instance, in Genesis 1 you’re hung up on the question of what individual words mean. But you don’t seem to have bothered to step back to ask what the nature and purpose of the passage as a whole is in the first place.
In the story of Baba Yaga, the phrase “chicken legs” really does mean that, within the world of the story, we’re to envision a hut with legs like those of a domestic bird. But that doesn’t mean that when I read my daughters the story I expect them to believe that there really is a witch who lives in such a hut (although for all I know there might be, or might once have been).
Since your explanation allows for a meaning to be simultaneously literal and figurative we are going to disagree.
Yes. It’s pretty hard to have a meaningful conversation with someone who can’t handle the idea that words can mean several different things (i.e., that something can be literal in one sense and figurative in another).
I don’t think atheists wish to be the authoritative interpreters of any holy books.
Then your entire approach makes no sense at all.
By being authoritative one is either the sole or final word on something.
Which you seem to think you are, on the Bible.
Atheists just are not going to cede the process solely to one group when discussion between those for and against is the far more reasonable process.
If we are talking about what the text most likely meant to its original readers, or what its original human authors (insofar as we can meaningfully talk about them at all) most likely meant, then of course. But so far you seem very uninterested in a serious historical-critical study of the Bible–another way in which you are very much like a fundamentalist.
But atheists and other non-Christians have nothing meaningful to say directly about the canonical meaning of Scripture. That meaning is the result of a process of discernment in which Christians (and/or Jews when speaking of the OT) attempt to hear the voice of the Holy Spirit speaking in the text. Since atheists don’t believe in the Holy Spirit, it is extremely odd for them to offer any opinions whatever as to what the canonical, authoritative meaning of Scripture is.
Scholars, whether Christians or not, have valuable things to say about the historical context and probable original meaning, which is one of the very important ways in which we discern the voice of the Holy Spirit in the text. So in that way non-Christians can have important indirect (name removed by moderator)ut. But again, you don’t seem very aware of OT scholarship or interested in discussing it.