Sure there is a large percentage of terrorists that are currently claiming to be muslim, but that doesn't mean everyone that is a terrorist is a Muslim nor should it be that all Muslim be feared by us.
They are not just claiming that they are conducting terrorist activities because they are Muslims. They are even claiming that they are just following what is written in the Islamic holy books. Here you can't really ignore the connection between Islam and terrorism.
It seems to me that things are not so simple. In addition to the fanaticism of the attacks need money and weapons. The simple fanatics and it's not available. It is well-managed troops. It's war of the worlds.