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The Omnissiah is The Machine's God equivalent to Jesus, and it's the Emperor, since he IS the greatest scientist still, kinda, of alive and can repair machine's with his psyker powers.
No, it doesn't have anything to do with islam, it's just called that for reasons that escape my comprehension.
Yakub... From the Nation of Islam religion/cult/conspiracy theory. He is accredited with the creation of the white man and evil using science because he was bullied or something.
Itachi after learning of Izumi 'treachery':
Wasn't Carbon?
Ah! Yes! The ancient art of learning someone's language just to better insult them and know their slurs!
Wasn't he mentioned in the previous tier?