Truth!
On the statues, I always saw the ones in Emprise and Hissing Wastes etc as Qunari looking. Even the SoQ pack decor has naked female Qunari statues. Just sayin' 
I touched the pyramid too...
I noticed the same thing myself, and it's not just the demon statues. If you look at the Colossus in the Wastes, it's got horns too. Mira, my Qunari, took the wrong path to the tomb and wound up on top of the statue's head, so I took a picture to note the family resemblance. It might have more to do with the fact that the dragons have horns, and dragons are the apex predators in Thedas.
Wherever you live, people make monsters out of their biggest threat. Their leaders put on costumes that make them look powerful and dangerous like their people's enemy. In Dungeons and Dragons, we had werewolves, but also wererats, weretigers, and werebears. Those things are what happens when people make a mistake and try to become what they fear rather than just putting on its skin.
A real world example is Viking helmets. They are pictured with horns, so they have them, right? Well, in a way, they do. The helmet a person fought in had no horns, they'd just catch a blade, and I know because my partner has one. The leaders were, however, buried with horned helmets to show their greatness. They were just for show, and their leaders wore them over their dead body.
Speaking of verifying myth, here's proof that pegusi existed in Thedas at some point.
