You say no one can kill them outside of people of shinju which is false. They are not gods just higher beings. Close to that of alien races than humans.
They are very mortal. They need food water etc.
List of people that can kill Naruto and Sasuke :
Kaguya and her children
What do they all have in common ? The power of the divine tree, keyword,
DIVINE
Only three people with divine power are strong enough to take them, if that doesn't make Naruto and Sasuke gods I don't even know
Whereas Kaguya needs none of that. She is the only one deserving of being called a God.
She creates and destroys worlds. Able to create life and play with death with zero drawbacks. And from nothing more than chakra.
The only one who has come close to doing such a thing was the one who gave them such a power in the first place and that's Hagoromo.
Except Sasuke and Naruto also have the power to use COAT, and as I keep saying
their power comes directly from Kaguya and Hagoromo, therefore their power is in the Shinju bracket ! lol
In addition, Viking gods were mortal too, they just couldn't get killed by anyone that wasn't a god, same goes for NV characters, Momo believed he was a god even though Naruto and Sasuke are stronger.
Furthermore, the feats you mentioned aren't the only thing make a god, in mythology many of them had different abilities that varied greatly in feats.
But Naruto and Sasuke have feats that you would 100% consider power of gods,
i.e : a flame that doesn't stop burning and turns everything into ash, TSB erasing all forms of matter, etc.
Madara and Hashirama were both acknowledged as gods even though their feats are below current Naruto and Sasuke
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