Ok, I admit it makes sense. Its somewhat hard to understand because elves are a whole new race and there is no analogy to make in real world. Anyway my personal opinion on the matter does not stem from Elves becoming like humans but they choosing to do it unchallenged. The life of the Dalish is a hard one as is any nomadic lifestyle. We had many nomadic tribes around Caspian sea and they all led lives similar to the Dalish. Its a hard life but you get to keep your identity, freedom and lifestyle while living near world powers such as Byzantine and Persian empires. This is acknowledged in Ferelden and Kirkwall, even if they know where the Dalish are many wont join because the life with Dalish is harder than living in alienages and most city elves are helpless and cannot fight in opposed to all Dalish clan members being fighters.
True, but for every nomadic tribe that kept their traditions outside the empires, there was another one who settled and became part of them. Also, life is harsh outside, although in a different sense. Settled populations usually provide more food and dedicate less time to get it. The Dalish nomadic lifestyle can't support a large population. According to WoT, they travel in "small bands, often made up of only blood relatives", and Briala counted "fewer than fifty" members in the clan in TME. Meanwhile, the alienage in Val Royeaux alone is said to have ten thousand inhabitants.
Life in the alienage is rough, but it's settled and you have a lot of people that can help you even during the worst times. Risking it to find freedom in the wilderness alone, without knowing anything about edible plants or hunting, travelling at the mercy of bandits, and all that to look for a clan of nomads that may have moved to another location by the time you get there needs a lot of faith.
Hm... I can't really argue with that. Fair enough... the Chantry forbid the worship of the Creators as one of the conditions for allowing the elves to remain free and alive within the borders of their nations. It sounds pretty generous considering the alternatives and the history of aggression between the two races. I'm not sure how strictly that is enforced now that several centuries have passed, but clearly this ban steered the city elf culture away from their old gods and to the Andrastian faith... After so much time has passed, however, I can't really blame the city elves for not being enthusiastic about embracing gods that they know little or nothing about.
It probably was harsher during the first generations. Afterwards, I guess that the Chantry stopped enforcing it because they assume that everyone is already Andrastian. Benefits of being the dominant religion and, most important, not being challenged inside. Other religions are usually associated with a country (Imperial Chantry, Stone, Qun), so in Orlais or Ferelden I doubt they are worried about conversions. However, I suspect that in Rivain is a different matter.