A bit of speculation due to a verse from the chant I found (working on a quote for Cullen...)
So, the chantry teaches that the spirits of the Fade were the Maker's first children, and they fall to become demons from jealousy of the living, his second children.
There's a dissonant verse (which, since the Shartan text is also considered dissonant suggests it was struck from the Chant later as inconvenient) that says:
"The Old Gods will call to you,
From their ancient prisons they will sing.
Dragons with wicked eyes and wicked hearts,
On blacken'd wings does deceit take flight,
The first of My children, lost to night."
---Silence 3:6
I first noticed the "wicked eyes and wicked hearts," but then realized what the last line says. First, the verse claims the Old Gods as the Maker's children. And depending on how you read it, his first children. Obviously, the Chantry would not want anyone to consider the Old Gods as children of the Maker for so many reasons. But is this "first" mean they were the Maker's first children, or was there someone between the fade spirits and the living who turned on the Maker before the Fade spirits started becoming demons...or when the Veil was created, they were powerful spirits left on this side of the Veil but related to the Fade spirits?
So many questions 