Enemity between Ra & Apep ? Who is HellHound ?

[furious flame]

https://en.m.wikipedia.org/wiki/Ra

https://en.m.wikipedia.org/wiki/Apep

Truth behind "why enemity" ?
RA slays the snake Apep ?
Apep threw to underworld ?
Then RA belongs to whom ?
RA a christian angel Or our God ?
Who is HellHound ?