Im not entirely sure they were really gods. He's something that was considered a god. Along with Mythal and the others. He's made several comments that the ancient elven gods weren't exactly what you think, they were something beyond understanding. After all, Solas was sooo surprised when he was in the fade physically during the warden quest. Even he could never enter it physically and flemmeth obviously has her limits. Plus they can be killed.
I'm hoping that you can choose to go with him in any dlc if we get one. I understand what he's trying to do and I don't think he ever had evil intentions. What we know of the dread wold and the other gods, as said many times, is wrong.
Also flemmeth, if you meet her in fade, tells you she's possessed by mythal. That she really was that old woman of the witch of the wilds legend that was betrayed by her husband. Mythal came to her and the joined and it sounds like flemmeth twisted her in a way. Thats why she needs to hop bodies and creates her "daughters" to sustain hersel and mythal for whatever her goals are. Her rant sounded super vengeful and shady. She is both flemmeth and mythal.
As for Solas, he is the dread wolf. He went to sleep long ago and woke to find that his actions before he slept didnt change the world for the better and this are worse off. So he tried to change it again. But he was to weak so he tricked Cory to do it for him but then everything went wrong. So he joined the inquestion to fix things.
He goes to Mythal in the end to explain his remorse for his crimes, which is genuine. But, he doesn't want to die. So he kills flemmeth before she can kill him which is what she was about to do. Then absorbs her power and maker no what his plans are.
He wants nether the old gods or man to rule, he wants a balance and for spirits to be free.
I don't think he wanted to ever be seen as a god or worshiped. He betrayed both sides in the legend on hopes with out either ruling the world, Peace and balance would be gained.
Anyways! That's how I took it.
So if we get a dlc, I hope we get a chance to go with him. Or at least have a night of passion before he goes away again.