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.
Muslims always claimed that they are the reason behind terrorism happening on this world even in other country specially here in my country muslims are living for too long and creating terrorism in my country and they still not fixed that problem and always facing it monthly. damn my country.
No surprise there. Wherever the Muslims live (it doesn't mater whether they are residing there for long time, or are recent immigrants), they create problems for the non-Muslims. This issue has become very serious after Saudi Arabia started using their petro-dollars to spread the Wahhabi ideology, starting from the 1980s.
The problem with these Muslims is that they are always wanting to force their beliefs on others. They are willing to wage war and kill to convert people. Mohammed and his associates spread Islam by conquest, accept Allah or die no wonder they choose Allah.