[...] Mohammad Sidique Khan, the leader of the July 7 bombings, and I were both part of the network - I met him on two occasions.

And though many British extremists are angered by the deaths of fellow Muslim across the world, what drove me and many others to plot acts of extreme terror within Britain and abroad was a sense that we were fighting for the creation of a revolutionary worldwide Islamic state that would dispense Islamic justice.

If we were interested in justice, you may ask, how did this continuing violence come to be the means of promoting such a (flawed) Utopian goal?

How do Islamic radicals justify such terror in the name of their religion?

There isn't enough room to outline everything here, but the foundation of extremist reasoning rests upon a model of the world in which you are either a believer or an infidel.

Formal Islamic theology, unlike Christian theology, does not allow for the separation of state and religion: they are considered to be one and the same.

For centuries, the reasoning of Islamic jurists has set down rules of interaction between Dar ul-Islam (the Land of Islam) and Dar ul-Kufr (the Land of Unbelief) to cover almost every matter of trade, peace and war.

But what radicals and extremists do is to take this two steps further. Their first step has been to argue that, since there is no pure Islamic state, the whole world must be Dar ul-Kufr (The Land of Unbelief).

Step two: since Islam must declare war on unbelief, they have declared war upon the whole world.

... For decades, radicals have been exploiting the tensions between Islamic theology and the modern secular state - typically by starting debate with the question: "Are you British or Muslim?"

But the main reason why radicals have managed to increase their following is because most Muslim institutions in Britain just don't want to talk about theology.

They refuse to broach the difficult and often complex truth that Islam can be interpreted as condoning violence against the unbeliever - and instead repeat the mantra that Islam is peace and hope that all of this debate will go away.

Be sure you read the entire piece. His message should be heard by Musims all over the world.

Related: Killing in the name of Islam is a cancer ...