That's if Abelas knows about the Veil story, and that's if its even true in the first place. Solas' power in Trespasser can be dismissed as a spell. Wynne could do the same thing in Origins.
How about the fact that Solas was going around saying, "We aren't gods"?
But this is all beside the point. Abelas thought they were gods. So he probably didn't know the truth about them.
And did Abelas know this about Fen'Harel or any of the other evanuris?
Title: "He clings to all that remains of his world, because he lacks the power to restore it." - Solas
What are youuuuu talking about? 
Abelas tone clearly suggest he is speaking in a way for Shemlens to understand while being subtle. His use of words are deliberate, god, pointing out Elves like Solas, etc. It is almost as if there is a bit of shame/sorrow behind his words all the while he projects this idea that he looks down on shems, the inquisitor, and his party.
He is speaking in this way so that he can't be judge outright nor his people be judged for whatever shame they carry.
"you stumble down our paths at the side of one of our own"-- paths plural and stumble are important. " It is not for you. It is not for any of you." I won't analyze the meaning of these quotes but the tone reflects what I stated above which is he speaks in a manner for shems to understand while projecting his superiority. There is shame in his tone also but more subtle. "It is a path, one walked only by those who toiled in Mythal's favor... More than that you need not know"-- path and toiled are important.
As for why he considers the Evanuris gods, look at the words I mentioned are important then consider this statement by Solas: "He clings to all that remains of his world, because he lacks the power to restore it."
Title: part 2: similitude
I am not certain what Wynne could do is the same thing nor can I posit them as different. There is a similarity that Wynne a "spirit" healer may have had advance magic that echoes in likeness to what Solas seems to do with ease. But, none of this suggest Solas power could be dismissed as merely a spell unless more than one other could display such feat and ease.
Abelas knew more than he was saying. Having met three figures from the world of Ancient elves, Solas, Flemeth (Mythal), and Abelas, I could say that saying less than you know maybe a trait of these elves, of the people. Oh
, I could be just like Abelas, who knew. Qunari time.