Ngl, as much as I avoid Naruto series fanfics even now (cuz of the blond re**** ninja and the fics they had as I mentioned before), a Sasuke one you mentioned sounds interesting. Heck, the Uchiha's ultimate techniques are named AFTER Shinto Gods. From the most prominent ones like Amaterasu to even the primaval/primordial ones that Shisui's ult MGS tech is named after (Kotoamatsukami or smth).
It is a shame tho.
Speaking of, I think the fanfics I like back then WITH Naruto series is one where at least Sasuke ISN'T being a hater or Naruto bashing on him or whoever. Yeah, Sasuke can be an emo kid or edgy even. But when you're out one night or you just somewhere in your home, and you come back to find everyone you knew, parents included, even those who probably were just strangers to you all massacred in one night by (at least to yourself) someone who was your family? That can make anyone so jaded and hardened.
Same for Itachi. Yeah, Itachi has done some messed up things. Thing he can never take back from even if he had somehow lived through the whole series somehow. But to say he's a loser or whatever, let alone this "ultimate villain" is really stretching it or just being critical on the kind of character he himself is of the things he did when he was still young. If anything, I'm more surprised now looking back that Itachi never lost his sanity. Or maybe he did but adjusted to it so well and/or kept it hidden that it's a miracle he can even function right away to go about his life after that.