Hi Andrew. I'm a complete sucker for the old gods. And having them wandering around modern Athens as cats sounds fabulous.
Skipping over the prologue for now, I loved this opening line 'The cat was older than the rocks on which he sat.' My whiskers are immediately twitching. It poses lots of question. I also have to mention this line, 'He felt so bad about terrorising and killing them that now he’s trying to fuck them into submission, one by one'. Brilliant.
So I think there's some really great writing in here, but...
I feel what you have here is something called scaffolding. It's loads of background information about your characters. As the writer, you need to know all this. The more detail the better because you need to understand how and why your characters behave and speak and react in the way they do. But the reader doesn't need to know the minute detail.
It's common in early drafts to have lots of scaffolding, because you're learning about the characters and story yourself as you write. But once you've got the story down, you then need to go back and weed these bits out.
You say yourself in response to some of the feedback, that chapter one gives the reason why the gods transitioned into cats. But as a reader I don't need to know that up front. I'm going to be intrigued by the fact there's these cats that are obviously a lot more than your average moggy and have the names of Greek gods living among humanity. The relevant bits of how they got like this can be drip fed in as the story progresses.
Putting the details up front is asking the reader to take on board back story before they've engaged with your characters and story. And if they're not engaged, why should they care. The reaction you will get is what you've had so far in the feedback. So, my suggestion would be similar to the others. Start where your actual story starts, which sounds like chapter 2. Get me straight into the intrigue and action, and then drip feed in your back story.
If it makes you feel any better I had exactly this problem with my old beloved opus. I ended up chopping off something like 15 chapters of Egyptian god backstory from the beginning. A big ouch, but it had to be done.
You've mentioned getting a manuscript review, but you might want to think about doing the Jericho self edit course instead. The work and feedback is centered around your own manuscript and the opening is something that is looked at. It's also where I realised those 15 chapters had to go! The tutor didn't actual tell me they had to be chopped (though she may have hinted rather strongly), but she gave me the tools to be able to look at the chapters and have that lightbulb moment that they weren't working. And most importantly why. There's also a ridiculously high publication rate for alumni. Something like 25%.
Going back to the prologue, I think you're giving away your story up front. There's an AI stripping the world of resources and letting humanity destroy itself. Only the cat gods can stop it, so they need to be destroyed. I know the story, so why read on?
I hope some of that is helpful in helping you edit and move on with the story. As always these are just my opinions so take what makes sense to you and discard the rest. Would be great to see chapter 2 when you've got over the trauma of this posting.