Whenever you bring in a large new group of people into an area it changes the culture. That is just a fact, not a value judgement. For example mass migration of different ethnic groups into Italy in the Fifth and Sixth centuries changed the language and culture of Italy forever. It is also a historical fact that whenever Muslims move into a new country they will endeavor to make the local culture Muslim. That is part of their religious doctrine; they must spread what they believe is the one true religion. The more Muslims that move into the country the more Muslim the country’s culture will become. Initially the changes they demand are always small, but then become larger and more numerous, until they come to dominate the country culturally, politically and militarily.