Humans are fallible, gods are not (in their domains anyway) so are there really gods, basically we learn that the gods are making it up as they go along.
It depends. In Christian religion God is indeed all knowing and infallable, but in Greek/Roman mythology they are certainly flawed (so they are in many others I think). In PoE their aim is to shepard humanity - cosidering Eora works on reincarnation there is no afterlife or "future hope" the aim is for reasonable present and what is best for Kith's future. Are Gods in Eora enforcing order and giving people hope as Thaos claims? If one believed in guidance offered by Gods, learning of how they came to be doesn't necessarily change it. Or does it? I found different answers for different characters.
True enough though I think Fate gives a certain...certainty to the Greek pantheon. As for shepherding humanity, that might be part of it, but ultimately it was to make reincarnation reliable, I'm forgetting if this was an existential threat or just something they'd developed the power to do. I also seem to remember that they modelled themselves after their gods, gods their society had stopped believing in, another interesting wrinkle. Who knows what are their stories, and what are the stories they've adopted...
Of course I'm half-remembering things from a game I played some time ago, so report back to us (and sorry)
P.S. I also happen to be replaying BG:2 right now, make of that what you will
