This post, I think, makes a compelling case for halting Muslim immigration into western countries. This may sound harsh, especially since we've been influenced by the civil rights era and our view of the equality of people. I think it can be argued that controlling immigration is not devaluing human beings, and therefore isn't subject to the same kinds of criticism as racism and American segregation are. Countries have a responsibility to protect their borders and to control immigration in order to maintain cohesion in their societies, and the post I linked to shows that this just isn't possible with Muslims.
Read it before you comment, because I'm not going to interact with people who have obviously not given the post a chance.