@Al Foley (sorry I can't quote) Why would Corypheous lie to us? He has no real reason to (being described as arrogance personified), as his success doesn't hinge on anything the Inquisitor believes. He has even less reason to lie when he first wakes up and is all confused by millennia asleep. He's not even talking to anyone when he states "But it was black. Corrupt. The City! It was supposed to be golden!"
And the fact that his statements and "memories" are consistent between both his original awakening (confused, lost, and generally discombobulated) and now... And besides: He had likely never heard of the "Maker" and so had no real reason to fear the scorn of that deity. Again: belief in the Maker and that particular faith system was started by Andraste AFTER the first blight.
Giselle says Corypheous is lying to himself to avoid believing he was punished by a particular God whom know one would even worship until a couple of centuries later.
That is not to say he COULDN'T have been lying. We'll have to wait and see.