And in similar fashion, I compare the Creators to Classical Pantheon of the Greeks and Romans because I think they fit much better than the Abrahamic God. 
They're an incredibly messed up 'family' of gods, each with their own spheres of influence. While they are not omnipresent, they do have shapeshifting and magical powers. They are extremely powerful, and they are arseholes. Worship of the Creators has even been replaced, through time, entropy, and occasional hectic violence, with worship of the Abrahamic God's counterpart, the Maker. The Maker is portrayed as so untouchable that he's not even paying attention to Thedas anymore. Andrastianism is about trying to please the unfathomable, impossibly high up father figure.
I'm not sure where I fall on the Fen'harel aspect. I love the idea of the gods being 'something we haven't seen before', and Solas didn't just make that one up. But I also love Solas's stories of the village and learning to wander the Fade. Then again, if the Fade wasn't in place in the early days of the Creators, that opens up a whole new can of worms.
The biggest suggestion to me of Solas being an elf that joined with Fen'harel is the Tarot cards. The Hierophant portrays a small white wolf and Solas, which is kinda cutesy. But it's the Tower card, with the shadowy, roiling mass of Fen'harel looming over and threatening to consume the lonely, wandering Solas, that makes me think that. Maybe it's just symbolizing the duty of the Dread Wolf overshadowing everything in his life.
Also, why would Solas point Leliana out to an actual ruined village? The fact that the ruins are still there suggests it was more recent than 8000 years. I mean, unless they were stone, and even then. We don't have many cities from 6000BC left. 
I dunno, basically. 
Yes, I fully agree, they represent these sorts of mythologies (it's not called "pantheon" for no reason). With a good amount of Northern mythology thrown in, obviously. But there has not been a living person "Gaia" (as far as I know they did not even bother to humanize her mother... or father... thing... deity "Chaos"). It is a personification of the Earth/life. And I very much like that concept, it is more tangible than the "moral entity" of the Abrahamic God, but it's still not people/humans. But that is pretty hard to show their "nature" in a movie or statue ("And here you see a statue of Apoll, the god of light, music, and ...." - "But there's nothing there" - "Yes, well, how do carve 'light' in stone?"), so it always comes down to people and human or animal bodies. Sure, I did not live back in the days when the old Greek and Romans still believed in these gods but I cannot imagine they really expected Zeus to be a person, bound to a human body.
I dunno either. It's mostly a gut feeling and a discontent with the "magical" notion of immortality of a physical body that I do not like. And I just think there has been a Solas and at some point he merged with Fen'harel. But the developers did well on allowing both theories and not planting any evidence whatsoever. Every piece of information can be twisted and used both ways. I simply do not like not to acknowledge just that, that it could be anything. There is no right or wrong (just yet, at least), in the end it might be something different entirely. If anything at all I think he is "something we haven't seen before". I mean, Abelas is an ancient elf, no? And he's "less" than a god, he's a slave to a god. So the gods are something different from the simple ancient elves.