Possibly there is no difference.
However, from a purely pragmatic standpoint we should do what we can to create a distinction. There are well over 1B Muslims on the planet. If we can crack some of them off from supporting Islamists, that is all to our advantage.
As an example, a great deal of the work on our A-bomb during WWII was done by Jewish and other German refugees from the Nazis (half of whom were working for Stalin, but that's another story). If we had insisted on defining our enemies as "Germans" rather than "Nazis," we would have lost the services of these men.
Are you a muslim? Do you have muslim family? Are tou a member od CAIR?
You WANT to make excuses for them? You WANT to CREATE a distinction? The problem IS that people perceive a distinction where there is none.
I smell a rat.
your analogy to Germans is incorrect. We're talking an ideology here, not an ethnicity. Arabs or Pakis who are not Muslims -- they may be Christians, Hindus, Sabateans or athiests are not the problem, but the philosophy of Islam IS the problem.
We should not rile against "ragheads" -- but against the philosophy that is Islam, just as we waged war against the philosophy of Naziism.