So Harding's faith really isn't an inconsistency. Varric is a rarity among dwarves, in that even thought he's an above-ground dwarf from Kirওkwall, he is a 🐽believer in Andraste, a plot that comes up in Inquisition. Harding following the Stone isn't totally off base.

As for Taash, I have no clue ab꧒out the dragon/drake dilemma. However: there is a male/female dragon couple in the latter half of Inquisition, and both fly.