How pervasive is extremism in the Muslim world?

How pervasive is extremism among the World's Muslims? It's worth making a distinction between Extreme Acts carried out by a tiny minority of radicals and extreme beliefs subscribed to by 100's of million of Muslims worldwide. Also, Ben Affleck drops by to offer his opinion.

Pew Research Report:
Real Time with Bill Maher: Ben Affleck, Sam Harris and Bill Maher Debate Radical Islam:
Country by country population statistics:

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