It is estimated that 6-8 million Muslims live in the U.S. but just for fun let's say it is only 1 million. With that many people that can not be assimilated as you say why is this not happening here in the U.S.?
Although the US Muslim population is difficult to know with any degree of accuracy, a realistic estimate is that there are at least 5,000,000 adherents. These 5 million come from a wide range of backgrounds. Some are immigrants, some are Americans who have converted to Islam and then there are the children of these people.
http://www.islam101.com
The muslims who have immigrated to the US and their descendents are presumably financially well situated and well educated. Thus, they are not typical representatives of their faith or their homelands. Therefore, I would expect that incidences of beating raped women would be less common among this group living in the United States.
Some would argue that this kind of behavior is what we would expect from a few radical fundamentalists. That may be true but if a Muslim takes his religion and his family seriously (and virtually all Muslims do), then I expect that the vast majority of Muslims are fundamentalists.
As for the number of crimes committed by Muslims living in the US, I dont have a clue. There are probably statistics on the number of reported crimes but even this may be difficult to quantify. I seriously doubt that we know about all or even most of the felonies committed by Muslims.
Eventually, these displaced Muslim doctors, lawyers, professors and engineers (who are living in the United States) will be joined by less sophisticated and less educated believers from their homelands. To see what impact future Muslims will have in the US, lets take a look at Europe.
The figures on Muslim rape of Western women in Europe are astounding. In Denmark and Norway, between 65% and 70% of all rapes are committed by Muslims, who as yet still less than 5% of the population. One local judge in Norway actually exonerated one rapist by accepting his defense that the victim's dress was taken by him to mean that she was egging him on.
http://fjordman.blogspot.com/2005/08/rape-nothing-to-do-with-islam.html
Although Muslim men are becoming well known for their crimes against Western women, their violence does not seem to be limited to women. Muslims make up some 70 percent of a total of 60,775 prisoners in France.
http://www.islamonline.net/English/News/2005-06/19/article04.shtml