The dwarf example is not exactly the same thing though. That was a new religion trudging in on a milenia old society (one that is also very radically traditionalist at heart) and finding conversion to their milenia old faith to be very hard to achieve.
The qunari, on the other hand, achieved the exact opposite: They smashed into lands where the Chantry was the primary faith for milenia, converted those who lived there (devout Andrastians) and when the Exalted March managed to reclaim the lands, they found that instead of being hailed as liberators, many of their former Andrastians now refused to abandon the Qun.
Comparing the two, the qunari did exactly what the Chantry failed to do at Orzammar.
What did they fail to achieve?
The Chantry established a big followers.
The Qun established a big followers.
Both groups refused to convert and brother Burkel died while demonstrating a peaceful demonstration.
Note that the magnitude is different. From the sound of it, the Qun forcibly introduce as well as possibly brainwashed people into believing while Burkel is more like appealing to a person's faith. You're comparing a crusade with the missionary, but that's besides the point here, the point is that those that they reach with their new ideology, they both converted because they found something lacking in their old belief system. Those who are adamant about their belief wouldn't change their belief no matter what regardless of whether it's peaceful conversion or forceful conversion. Those who claimed to be devout could very well be a believer for the sake of believe, They have to believe in it because they have nothing else to turn to, if a new ideal was introduced, some of those devotion could very well switch targets. All I'm saying is sometimes, it's not about how good or bad a certain beliefs are, it's about understanding the psychology and what a person turn to religion or a new ideology. For a short real life example, some of the members of Heaven's Gates cult was not clueless people who were tricked into it, some of the were professionals and well educated, There were a variety of reasons why they turn to a cult, but they weren't being forced into it, those that were forced into it by their loved ones ran away, Those that stay stayed because they found someone in it that they didn't find in their daily life. There are also stories of Americans convert to extremists and homegrown terrorists. In some of these cases, it's not about the morality or being force into anything, it's about whether a person can identify with that idea which could very turn into their new purpose in life.