A muslim is a practicioner of Islam. What's not to get?
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Not all Muslims are going to obey all of the Koran, nor will they be as devout as a suicide bomber. It is obviously very stupid to try and suggest that all Muslims are as bad as their evil little religion. There is a massive distinction. The unfortunate thing is, as Dawkins mentioned, you do not need a majority or even a very large number of followers to believe the majority of Koran for there to be mass death and severe problems.
Even a small percentage is significant if they believe it is good to blow you up (Jihad), not to take christians, jews and unbelievers as friends (Koran verse) and if they believe you are to be conquered. You have to understand just 1 thing:
Koran/teachings = Cause
Some Muslims = Effect.
proof of this is seen in Iran, Palestine, Iraq, Lebanon, Libya, Turkey (to an extent), Ivory Coast, Pakistan, Afghanistan and 100 other places.
So it is either a massive coincidence that these places are the way they are, or Mr. Islam has something to do with it.