The world of Naruto, created by Masashi Kishimoto, is one full of culture, powerful creatures, and clans of ninjas with bizarre abilities. Each ninja clan usually has its own ability, or jutsu, unique to it that only members of that clan can use. One of the strongest clans in the series, the Uchiha, has a collection of god-tier jutsu.
The Uchiha clan's justu is an ocular ability called the Sharingan which gives the user red eyes and intricately patterned pupils. At first, it grants the ability to anticipate movements and copy another ninja's jutsu. After the user faces enough trauma and strife the Sharigan evolves into its next stage: Mangekyou Sharingan. This is when the Uchiha gain access to their godly abilities: Amaterasu, Tsukuyomi, Susanoo, and others.
To call these jutsu godly is appropriate considering that is exactly what they are: gods. Just like the powerful Sannin trio, Kishimoto takes several aspects of these gods and incorporates them into his series as the strongest jutsu ever to be seen in the ninja world. Their inspirations come from the major players in Japan's Shinto religion. To grasp how the series uses the gods, it's important to know the Shinto creation myth. Japan and its gods were created by Izanagi and Izanami. After giving birth to the god of fire, Izanami died and went to the land of the dead. Izanagi traveled there to retrieve his wife, but upon finding her, found that she was terribly decomposed. Horrified, Izanagi fled and washed the impurities of the dead from his body. The water that dropped from his face became Amaterasu, Tsukuyomi, and Susanoo.
The Shinto Gods as Jutsu in Naruto
Amaterasu, known to Naruto fans as black flames that burn until the user wills them to stop, is the goddess of the sun and ruler of the heavenly court in Shinto beliefs. In traditional Japanese art, she is often depicted with long, flowing, black hair and the sun positioned just behind her head, like an elegant crown. This is possibly where Kishimoto got the idea to depict Amaterasu as unrelenting black fire. The jutsu is also cast from a Sharingan in the left eye, a clear reference to Amaterasu's birth.
Her brother, Tsukuyomi, rules over the moon and is often depicted as a calm and collected monk sitting beneath the heavenly body. He is viewed in a somewhat negative light, mainly because he once murdered another goddess solely because he found her disgusting. This created a rift between Tsukuyomi and Amaterasu, which is the reason why there is night and day. In Naruto, Tsukuyomi is a genjutsu made famous by Itachi Uchiha that traps people in a nightmare that seemingly lasts 72 hours, but really, is over in an instant. Using the moon to trap the world in an infinite Tsukuyomi is the villain's endgame. Naturally opposite to Amaterasu, Tsukuyomi is cast from the user's right eye.
In contrast to Amaterasu and Tsukuyomi, Susanoo is brash, loud, and destructive, just like the seas and storms he is responsible for. This translates directly into Naruto, as Susanoo is the most destructive of the three jutsu. In Shinto beliefs, Susanoo is kicked out of heaven by Amaterasu after he flays a horse and throws its corpse into her throne room. He redeems himself on Earth after slaying the eight-headed serpent and gifting the Kusanagi sword (another mythical item in the series) to his sister. In Naruto, Madara Uchiha wreaks havoc on the ninja forces by using his impenetrable Susanoo. Despite being born from Izanagi's nose, Susanoo is cast with the power of having Mangekyou Sharingan in both eyes.
As it should be, Izanagi and Izanami are also jutsu in the Uchiha's arsenal. Izanagi is a genjutsu so powerful that it renders the user blind after one use. It allows its user to change reality for a few seconds and due to this limit, it has only really been used to save someone's life, heal from lethal wounds, or trick an enemy into thinking they've won. This makes it very similar to the Reality Stone from Marvel comics, just with a time limit. In relation to the myths, it might be inspired by Izanagi's yearning to change reality so that Izanami never died.
That leads to Izanami. Like Izanagi, this jutsu also takes the user's sight away. It is the most complicated of all the Sharingan jutsu, so to put it simply, it traps someone in a time loop until they acknowledge their flaws and commit to changing themselves. When Sasuke and Itachi fight Kabuto during the Fourth Great Shinobi War, Itachi uses Izanami on Kabuto in an attempt to have him reverse the reanimation jutsu. It seems that Kishimoto took creative liberty on this one as it doesn't really relate the myth to the jutsu, but it is similar to the bargain Doctor Strange made with Dormammu in the MCU.
Last, but definitely not least is Kotoamatsukami. It's noted as Shisui Uchiha's ultimate jutsu, and like Izanagi, is a reality-warping genjutsu. The jutsu creates false memories and fake sensory experiences that make the target believe they are acting of their own free will, despite being manipulated by the user. It doesn't render the user blind, but it does take a decade to recharge. Unlike the other gods that make up the Uchiha's ultimate jutsu, the Kotoamatsukami are actually a collection of gods that ruled in high heaven long before Izanagi and Izanami ever existed. Not much is known about them other than them being responsible for creating the universe in Shinto belief.
These jutsu are the reason Sharingan users are feared in the ninja world. Now, it makes sense why Itachi and Madara Uchiha are referred to as "gods of shinobi": it's a play on words because that's literally what their powers are. To run through them all again, there is Amaterasu, goddess of the sun, Tsukuyomi, god of the moon, Susanoo, god of seas and storms, and Izanagi and Izanami, the creators of Japan. Along with the Kotoamatsukami, this collection of deities makes up the strongest skillset seen in Naruto.