So Harding's faith really isn't an inconsistency. Varric is a ra🅺rity among dwarves, in that even thought he's an above-ground dwarf from Kirkwall, 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 about the dragon/drake dilemma. However: there is a male/female dragon couple in the latter half of 𓆉Inquisition, and both fly.