And if the qunari were buying and selling their own people to each other, slavery might hold up as a comparison.
Slavery does not require slave trading; it can be hereditary, or caste-based. Although the latter is more commonly called 'serfdom', yes; different words, pretty much the same brand of suck for those on the bottom, tho.
Fair point, and if it turns out the Qunari way of life is just a house of cards, obviously my statements here won't be valid. But the Qunari that we've met and what we have read of their culture in codex entries, as well as all the converts to their religion that we've read about, think of it as the perfect, ordered society that I'm defending here.
Which means exactly nothing, because belief doesn't remotely determine objective reality. If I tried to post a list of every belief system on Earth that was a horrid failure in reality and yet still had millions of fanatical believers who all with total sincerity thought that it was the path to paradise on Earth, this server would crash.