There is no single mention or idea supporting The Maker(not a creator deity in general) before Andraste and her Chant of Light.
What The Chant of Light and by extension Andraste(who is the only being we "know" interacted with The Maker) says about The Maker, that can reasonably assumed wasn't edited by The Chantry, since it would serve no purpose:
Maker made The Fade, then he made Spirits who didn't have free will/creativity and intercted with them.(Spirits not a reflection formed from the emotions and ideas of mortals.)
Then he made the Golden City and interacted with the Spirits.(No Spirit remembers The Maker or knows of a Spirit that does, and while some Spirits believe it exists, they do so only as a reflection of mortal believes.)
Was disappointed in Spirits becasue they had no free will/creativity, so he left the Fade and made Thedas.
At the same time he made the Veil.(No)
Which he populated with Humans and Elves who had free will/creativity.(What about Dwarfs? What about Cole? How does this reconcile with the Elvhen being in the Fade?)
{In this order according to the Chantry: Fade, Spirits, Thedas&Veil, Humans&Elves. No mention of Titans or Dwarves.}
The Old Gods were jealous spirits and convinced humans to worship them.(Coincidentially, the same number and with similar themes as the Mage-Kings that Solas sealed away...)
Maker departs.
The Magisters Sidereal enter the Golden City, this is claimed to be what created the taint, the act of going in and out of the Fade twisting the Magisters.(We know this is BS.)
That the City was blackened by the Mags entering it.(Corypheus says the inside was already Tainted, not just blackened, Tainted)
How can The Maker as defined by The Chant in anyway exist if it's already been proven in canon that The Chant is way wrong? As for the Golden City, it fits the description Solas gives about Ancient Elvhen Architecture, and the knowledge that the Veil is a recent development as well as the what we see happened to a different Super Fancy Elvhen Building (The Library) when the Veil was created, we can reasonably assume that the Golden City is Arlathan.
As for why Arlathan is Tainted? While Solas rebelled because Mythal died, he created The Veil to prevent everything from being destroyed. Corypheus claims The GC was already Tainted when they stepped in. The descriptions of Andruil from when she went into the Void closely resemble someone being affected by the Taint. Red Lyrium is the Tainted Blood-Analog of the Titans/Mobile Instrumentality Geofront.
The Elvhen mined Lyrium, and at least the Evanuris and Forgotten Ones knew how to access The Void.
The Evanuris directly messing with Titan probably caused it to become Tainted. **** gets real, Solas plays both The Evanuris and Forgotten Ones against each other, then seals them away with The Veil and completely cuts off Arlathan from direct access by Eluvian, if it wasn't war-time measure implemented by the Evanuris themselves. Except for the Eluvian that you find in the Dalish Origin that had somewhat working connection.
Most of what the Maker is responsible for according to The Chant of Light is shown to either have been done by others, or to not actually have happened. Aside from the Origin of Humanity on Thedas, most of the things we don't know have a lot more evidence and implications of it being caused by Normal Magic, pre-Veil magic, the Void, or Titans.
Faith is trust or belief without strong evidence for it, Delusion is trust or belief despite strong evidence against it. The Maker, according to Bioware, is supposed to be a narrative representation of Faith, but it is done so poorly it actually represents Delusion.
Just like you can twist a Spirit of Compassion into a Demon of Despair, even if you don't mean it, the ambivalence on the Maker's existence as a narrative tool was a good idea ruined by shitty execution, and should be put down just like a Demon. Specially since unlike a Demon, the process can't be reversed without some hard retcon.
If DA has a Creator Deity, it is in no way related to The Maker beyond coincidence, and it most likely doesn't interact with its Creations. Probably because Creation is exactly what it inteded it to be, and intevening with events would make Free Will pointless. The ability to fail making success mean something.