But it is. Especially since you haven't laid out explicitly why Muslim groups don't integrate as well as others groups after I asked you. I'm skeptical because as a minority in America none of the complaints I've read about the refugees in Europe are anything I haven't heard before used in the US. There are differences sure, but I don't believe they're that unique to the point where people can use it as an excuse for failed integration.
Is it insular commmutiess?
Is it not speaking the native tongue?
Is it not being economically successful?
All of these apply to America as well. They key difference is the religious one but even then that doesn't account for the millions of Muslims who have successfully integrated in Europe.
Edit: Not trying to be a hardass, just genuinely want to know if it's a actual difference or if it's just Europe's inexperience with dealing with a large influx of outsiders that's causing the issue.
Europe has dealt with (some) previous immigration waves with success. France and Germany received mass amounts of immigrats from Italy and Spain after WW2 and Yugoslavia during the 90's. Those families are now fully integrated, not unlike many Polish people in the UK and a large amount of Romanians in Spain. It should be noted that both Spanish and Italian immigrants also faced significant discrimination at the time.
One of the chief differences is that while immigrants tend to be insular as it's easier to find support within a community, some Muslim immigrants are
specially insular. Many French and Spanish citizens immigrating to Germany and France during the 50's and the 60's quickly married outside of their group and opened business catering the main population. One generation in their descendants considered themselves citizens of their parents' host country instead of Spanish or Italian. The same is also true for many Latinamerican immigrants today. Mixed couples are plentiful.
Meanwhile, Muslims, and particularly those from certain, less socially developed countries (Lebanese and Iranian Muslims have traditionally integrated themselves
very well in their host countries, so did pre-civil war Syrian nationals) are much more socially conservative than your average immigrant. It's not that they don't talk the local language, which most of them understand to a decent degree, but that a sizeable amount of them don't venture outside their communities. It doesn't help that they are much more socially conservative -if not regressive- than their host countries, creating friction with their neighbours.
This is not something that hasn't been examined before. The social dynamics are a complete mess and not very comparable to any other group. A study from the University of Barcelona (IIRC) focusing on the immigrant population of Spain found that most young Muslim women want to marry a man outside of their group, and that those who do so not only become more religiously relaxed, but their children enjoy better academic success. Meanwhile, Muslim men vastly prefer to marry Muslim women. If they marry a local, they largely expect her to convert. Also, their offspring doesn't fare as well as that from Muslim women married to non-Muslim locals.
While there's a core of racists dead set in preventing proper integration, one of the biggest problems with the way we've been handling immigration for the past decades is the idiotic belief that throwing people into low income neighbourhoods and forgetting about them would be enough. After all, it worked during the 50's and the 60's, right? Nevermind the fact that jobs were plentiful back then and those low skilled immigrants were dead set in making their host countries their home instead of replicating the conditions from their homelands or simply fleeing away.
Different immigrant groups carry different attitudes and social conventions that need to be individually addressed. A Lebanese or Jordanian immigrant is probably vastly different from a Syrian, a Libyan or an Afghan refugee like the ones currently rushing towards Europe, and none of them can be expected to thrive like other immigrants did in the 60's.