Even when they weren't speaking, Alhaitham dogged Kaveh's every step through published responses to Kaveh's research articles in academic journals. He insisted on keeping a line of communication between himself and Kaveh open, even if the only way to do that was through very public ideological clashes. Pulling Kaveh's pigtails to get his attention lolol. It's implied that, for at least the few years between their fight and Kaveh moving in, this was the only communication between them--Alhaitham's refusal to allow their connection to entirely fade away. (And the fact that this is revealed in Kaveh's character stories--through his precious journal that records the moments of his life that had the most impact on him--shows just how deeply he values the fact that Alhaitham didn't give up.)

Another relevant side note: Alhaitham never asked Kaveh to give up his half of their house. Knowing half of it belonged to Kaveh, knowing that Kaveh may one day want to reclaim his part of it, knowing that it was listed as theirs, Alhaitham moved into the house and made zero effort to change its ownership. He was completely fine with living in "his and Kaveh's house." The stories suggest it was only months later (or even longer) that Kaveh even noticed he had the house, and he transferred away ownership of his portion without Alhaitham ever asking him (or even seemingly wanting him) to do so.

Please, let that sink in. Alhaitham actively left his grandmother's (presumably comfortable) house to move into "his and Kaveh's house," with no apparent explanation for why, and after doing so, he made no attempt to change that "his and Kaveh's" label. He moved into the house with no promise that Kaveh wouldn't show up on the doorstep the very next day and move in too. It almost feels like another deliberate provocation--I've moved into our house, are you going to come stop me? LBR, if Alhaitham had had his way, Kaveh would have been living there with him from Day 1...

There's also the fact that Kaveh literally can't write on a single message board anywhere in the entire nation of Sumeru without Alhaitham hunting his messages down and responding to them (which absolutely no one else does, by the way).

"NUH-UH!" "UH-HUH." "NUH-UH!"

Alhaitham's own character stories tell us explicitly that one of Alhaitham's defining character traits is "He is never where you need him to be," yet somehow...

Shot, and chaser:

Any time Kaveh is in the slightest bit of need or danger or just wants Alhaitham near, Alhaitham is "coincidentally" exactly where Kaveh needs him to be, whenever Kaveh needs him to be there.

Alhaitham didn't just "happen" to run into Kaveh in Port Ormos, an entirely different city from where he was supposed to be working. He didn't just "happen" to read the same terrible book as Kaveh when we know he otherwise would not waste a moment of his time on poorly-written literature...

He didn't just "happen" to appear when Kaveh was upset and needed a distraction in the House of Daena during Kaveh's hangout. He didn't just "happen" to be sitting around waiting when Kaveh needed answers after the Archon Quest. He didn't just "happen" to find Kaveh's academic publications and every single message board posting and respond to them at length and in public.

Which is exactly what Kaveh's mother told Kaveh he needed.

What level of down bad is "Abusing your powers as an Akademiya employee to keep tabs on your crush's library loans"? Just asking for a friend.

The only person for whom Alhaitham just "happens" to be available is Kaveh, over and over and over again--because he is very deliberately making himself a constant presence in Kaveh's life.

(Like, out of all things, I think people really underestimate the devs deliberately paralleling the romantic relationship between Kaveh's mother and father with Kaveh and Alhaitham's relationship. If you want to point to one thing that says "These two characters are intentionally queer-coded," it doesn't get any more obvious than this.)

I'm going to start off by giving a deeper explanation on how Angeal represents Adam and how Genesis represents Eve. Genesis already has a very strong connection to The Book of Genesis because of his name. Rhapsodos comes from rhapsody, his full name is literally "genesis reciter". Genesis and Angeal were the first two attempts at an artificial “cetra” created by Shina representative of Adam and Eve being the first humans created by god. (While there is some debate if the first woman is Lilith, she is often been seen as a demoness.) The kanji for Shinra already is a direct reference to god, and is symbolism for how they like to play god themselves. The image below has a great explanation that is much better than what I can do, but to keep it short 神 (shin) literally means god or divine and 羅 (ra) is derived from 網羅 (mōra) which means "encompassing".

The fruit of knowledge is typically portrayed as an apple, which connects with banora whites. It represents temptation, Genesis offers the apple to others when talking about truth and revelation. Instances like in Nibelheim, Genesis offers the fruit to Sephiroth after telling him the truth of his origins. Sephiroth rejecting the fruit is a sign of him rejecting the truth, and we see he continues to go along with a story he is happier with. Sephiroth decides to believe misinformation that is less painful, the rejection of knowledge is indication he is not Adam or Eve.

Banora is heavily connected to the flow of the lifestream, which is what makes Banora whites grow any time of year. The lifestream is said to contain knowledge of the planet and its people, that being what powers the fruit further reinforces the idea that they represent the fruit of knowledge. Banora being the source for what is essentially miracle fruits powered by the planet, it is clear Banora is meant to be Eden.

Minerva is said to be sleeping in the caves of Banora, she represents the will of the lifestream. Though Minerva is connected more to Roman Myth and Sophia from Gnostic belief, I would still say she emphasizes the holiness of Banora's land.

Angeal has a story about not stealing to reflect Adam trusting god and not taking from the garden. God's words to Adam were "You are free to eat from any tree in the garden; but you must not eat from the Tree of the Knowledge of Good and Evil, for when you eat from it, you will certainly die." (Genesis 2:17) Angeal stole from other trees besides the big one that had the most delicious fruit. While it can be argued Angeal didn't steal from Genesis in general, Angeal's story focuses solely on the biggest tree with the most tempting fruit, that tree represents the tree of good and evil. At the end of the game, Zack eats an apple under this same tree with Genesis, protagonist and antagonist sharing from the same tree. Shortly after eating the apple Zack learns the truth about how long it's been and leaves to meet his fate.

Hollander approached Genesis with the truth of his origins, convincing Genesis to help him with his plans in exchange for a cure that Hollander never had. Eve was afraid of eating the fruit and dying because of what God told her, but the serpent convinced her she would live. “You will not surely die. For God knows that when you eat of it your eyes will be opened, and you will be like God, knowing good and evil.” (Genesis 3:4-5). Both being deceived, they were convinced that they would live if they defied God, and become the catalysts for knowing the truth. Eve did not want to be alone in her defiance so she looked to Adam, much like how Genesis approaches Angeal to persuade him to take revenge against Shinra.

Besides Eve being referred to as Adam's wife, Adam also placed his trust in Eve above god. He decides to listen to her and trust her despite his creator telling him he will die. Angeal places his trust in Genesis above Shinra when he decides to defect, believing he can rationalize with him despite this being high treason.

This has happened before already, Angeal placed his trust in Genesis above Gillian and defies his mother to join Shinra. Gillian didn't want her family to be connected to Shinra and despite how highly Angeal respects his mother he still defied her wishes for the sake of following a dream with Genesis.

This leads into the next part, less about how they parallel The Book of Genesis and more about how they parallel other characters in the narrative. This makes me a little nervous to talk about so I’m going to put a small disclaimer that I am not arguing for any canonicity of ships because I think it is a waste of time. However, I think discussing characters' feelings that push their motivations is important.

In the narrative, Angeal also greatly parallels Cloud, I feel like this isn’t something that is talked about enough in general. They share a great deal of small parallels like both enjoying landscape photography, being associated with wolves, and elementally representing lightning. Besides surface level things, both Angeal and Cloud have a guilt complex and feel responsible for the people around them. The main parallel that’s important to this conversation is their childhood friend from the same countryside town.

Cloud was inspired by Sephiroth and his desire to protect people he loved like his childhood friend, Tifa, to join soldier. This is similar to Angeal joining to be with Genesis; their childhood friends are motivators for both of them.

This is something that’s pointed out in DFFOO as well, Angeal hears about Tifa and immediately draws the connection.

Both Cloud and Angeal feel responsible for protecting and looking after their loved ones, Angeal is seen as a caretaker type for this reason. Both Cloud and Angeal want to help fulfill the dream of their childhood friend, Tifa's was being saved by a hero and Genesis' being to share an apple with his hero Sephiroth. We see this when Cloud berates himself for not being the hero Tifa wanted and Genesis telling "Angeal" the dream has been fulfilled implying it has been something he knew about and wanted to help him achieve. Angeal's will in Lazard only fades away after Genesis said the dream came true, like there was a sense of fulfillment and that he could finally pass on after holding on for so long.