According to numbers from
FBI's official website, muslims are responsible for only
6% of terrorism in the US between the years 1980-2005. It isn't much compared to Latin-Americans who are responsible for 42%.
The media just has the tendency to make the sake a bigger issue than it is, when it's about muslims, because of 9/11 of course.
link
That's the hole article if you're interested. The dude who wrote it is pretty good.