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 Maker/Creator Deity, it is in no way related to The Chantof Light's version, 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.
The existence of a Maker or lack of one can both work, but claiming that said Maker is the one described in the Chant completely messes up things.