I asked because you mentioned earlier that you love what you written, I just wanted to be sure you're prepared to hear that someone may not be too keen on what you've written even may actively dislike it. There's always a chance you could get some feedback that could come off as more disheartening than encouraging even if the critic is not intending to bring you down. I also wanted to understand how seriously you're taking writing, whether that be bettering it for your own sake or so you could garner an audience.
I coming at this from the perspective of a 'hard to please' reader (because I don't particularly like reading) and from someone who has completed a manuscript after working on for a few years. So take my advice as lightly as you so choose since I'm also a person who needs to work on bettering my literature. Before I get started, good on you for starting a book and asking for advice. I know both of those things can be pretty daunting so you should be proud of yourself.
I'm going to be quoting some lines from your text while going throughout this.
Introduction
"First let me start off by saying I don't know how to write a book, nor do I care to learn."
This is the main reason I posed the my question from before. Your answer here in the thread contradicts the first thing someone would read after clicking on your link. I have to go based on what you've said here, that you do mean to get better for whatever reason. But, if you do want genuine critique I recommend changing what the introduction says because it does come off a tad arrogant and like you wouldn't listen even if someone did give you advice.
Chapter 1
Here's the thing about opening sentences, paragraphs, and the first chapter. Your goal is to draw the reader in, either through an event happening in the narrative or through your use of words. Your first few sentences are the POV character rambling on, trying to remember on which day a supposedly important even occurred.
"It was a rather peculiar Saturday morning-or was it Sunday? No, it was Saturday (I'm pretty sure). Anyway, there wasn't a cloud in the sky. Okay fuck this is kinda pissing me off. Was it Sunday or Saturday? Ah hell if I know, all that matters is it was some two years ago."
And it doesn't seem like the character can't remember because the event was traumatizing or because other, more pressing things on on their mind. It seems as though they couldn't be bothered to remember this world altering event. If they cannot be bothered to care about this catastrophic thing that happened, why should I, as a reader, care? And as the story goes on, it's hard to tell if the sky being stolen has any bearing on the rest of the plot. It feels as though any other apocalyptic inducing event could have occurred and everything else would be the same. What about aliens stealing the sky made the characters in the story who they are and how did it affect them specifically to make the decisions they've made? If this is supposed to be about aliens stealing the sky, it doesn't feel like it. But if it's not, maybe have the apocalypse be caused by something more believable.
Now, the first chapter feels like, well not feels like, it is an info dump. Explaining what happened with little insight from the POV character. And if there is insight, it's quite shallow. We don't know how this affects them, if they care, if they lost something or someone important to them. I don't understand the POV character, I don't know them, and therefore I don't care. No time is spent on developing them. And they are the only person I as a reader was stuck with listening to for 2 chapters, all the while wishing there was another person there for the POV character to bounce off of. But then Chris shows up only to die quickly after not saying or doing much of anything.
It also feels as though the vulgarity presented doesn't have much utility outside of shock value. If some of the edgy things the POV characters is saying are supposed to be comedic, they are missing the mark. Rather than a laugh, chuckle, or a snort I cringed, furrowed my brow, and openly asked the empty room I was in while reading this "Now, why would they say that?" I'm not saying to get rid of it, just that, if you're going to be vulgar, you need to do it with purpose or you might turn a lot of people off, even people you are okay with certain degrees of obscenity.
And I can understand not having a likable POV character, but you should at least have a tolerable character. The POV character is unsympathetic, shallow, obnoxious, gross, and more self-righteous than anyone that could be a part of the SRPAs. And I hope that was the point.
Chapter 2
This chapter was confusing because it goes back and forth with the timeline. Twice before we even get to the meat of what the chapter is even about, the warring between cults, the POV character mentions that he shot and killed Jim Bob. Both instances made me think that he was moving on from the (kind of pointless) backstory for that character. But then he keeps going. This story about Mee-maw and Jim Bob is quite difficult to follow. Mainly because the story is being told without many ground factors, like a stated timeline(this happened first and after this much time, this happened) or clear transitions (next, and then, afterwards, before that, etc.).
This lends to the idea that the story lacks structure and flow. I can't tell what order things are happening in. And a confusing story, a hard to follow story is not a story worth putting in the effort to understand for most readers.
Chapter 3
I don't have much to say about chapter 3 because I only skimmed it, so let's get to the overview.
Overview
Overall, these first three chapters lack structure. I feels as through you wrote a stream of conscious and split up the chapters because the word count was enough for three. It doesn't seem as through there's an overarching story.
This is a situation where I think you should go back to the drawing board and figure what you want out of this story and where it's going. What is this story about? Is it about warring between faction after a cataclysmic event? Is about one person's story post apocalypse? Is it about both? I'm not saying you have to pick between one of these, but one them should be central to the plot and characters. And from figuring out what the story is about, you can make an outline, detailing plot points and defining a timeline so you know how one event flows into the other. Because as it stands, things don't really flow in a way that makes sense and is satisfying.
The POV character's language is filled with insults, clichés, stereotypes, and hatful words towards people they don't know, don't understand, and don't want to understand. I don't care for their opinions, their actions are barely justifiable, and it was hard to stick through a read things from the perspective of someone who was intolerable. Like I said, the POV character doesn't need to be likable, but they need to be tolerable enough that a reader, despite their preconceived notions and prejudices, would be willing to hear them out as they navigate through the world the story is set in. They are underdeveloped and therefore not interesting enough to maintain a reader's curiosity. Very few people will stick around to read about a beacon of edgy takes and morally questionable behavior.
I decided to put all of my nitpicks here at the end because I think they distract from what I'm trying to say overall. So if you care to read:
Nitpicks
(in reference to chapter 1)
Speaking of this world altering event... (and this is more a nitpick) Ok, I get that it's fiction, and with fiction the readers have to suspend their disbelief to an extent. That's easier to do if the author has set this up in a way where the reader is informed of the rules of the world slowly as they read through or prefaced with the rules very early on. I can't suspend my disbelief when you say the sky has been stolen, because the only reason we have a sky is due to the sun and the earth's atmosphere. You can't have the sky without both, and if you have one but not the other, the planet would be wholly inhospitable and unlivable. It's fiction so you can't get away with it, but it made the rest of my read... labor intensive.
"The two gathered the blinds and shackled them together, reminiscent of a rather peculiar institution."
I don't get why you would just come out and say it here: it's either prison or slavery. Like, say it with your chest. You said so many other things unabashedly within these chapters.
"They shot a round into the air with their shotgun and said the famous southern line, 'Yous best go on back to wheres ya cames from'"
This isn't southern, well it's more like half way there. You know how I know this isn't southern: 1) I'm from texas and 2) there's no y'all. The one thing American southerners are known for saying and you didn't include it. Nice.
Lastly, I want to commend you again for 1) writing a book (or starting a book) and 2) being willing to seek advice. I can be difficult when you starting out to hear that what you've made isn't perfect. Structurally, there's lot to work on, so I would recommend looking up how to write an outline for a novel just to get a basic idea on where to start. I hope this helps, at least a little, and gets you think about where you want to take this book into the future. 
