It is the feeling amongst some Muslim that the glorious days of Islam has vanished because they are not true followers of Islam and to 'cleanse' themselves they are taking the fundamentalist path.
In Quran there are versus which are intolerant, as Mohammed grew in power and Islamic empire also grew, the versus from his mouth became more conservative and vengeful on people from other religions.
The doctrine of Muhammed is to make every one to obey his teachings and follow the rules laid by Quran. Just like any other Abrahamic religions.
But Islam teaches to be violent when it comes to defend or spreading. This is where the problem lies.
The terorrists take their inspiration from The Sunnah, the life of their prophet. When Muhammed and his followers are minority they raided caravans of Jews and Christians for money which is essential to grow in power, resorted to guerilla tactics on majority to make them weak(Justification is that in 7th century Muslims are minority and they have to survive by any means) . This is the inspiration for the Fundamentalists who are waging wars on bigger powers.
These tactics are a part and parcel of dirty politics we see in daily life every where in this world.
Islam is a complete package, there is no such thing as political Islam. In Islam every man is a soldier of Allah and he has to do his sacred duty to defend and spread the message by hook or crook.
Islam itself is like a political ideology with religious angle. Reason why Muslims have the problem with democracies and other forms of governments.
Quran and the ministry done by Muhammed is the model for Muslims. This is the main problem for Western and other democracies who see as blocking factor in Globalization and establishment of free world.
But categorizing all muslims as fundamentalists is not correct in my view.
Ajit Doval is talking about a Fatwa issued in favor of Arabs when newly converted Turks are bulldozing the Arabian Caliphate. The Fatwa says since "Turks are new converts they should be killed where ever we find them".
But the fatwa is denounced and the guy issued this fatwa is jailed later.