Islamic extremism has been defined by the British government as any form of Islam that opposes "democracy, the rule of law, individual liberty and mutual respect and tolerance of different faiths and beliefs." Related terms include "Islamist extremism" and Islamism.
On the other hand, many oppose the use of the term, fearing it could "de-legitimize" the Islamic faith in general. Some have criticized political rhetoric that associates non-violent Islamism (political Islam) with terrorism under the rubric of "extremism".
The UK High Courts have ruled in two cases on Islamic extremism, and provided definition.
Aside from those, two major definitions have been offered for Islamic extremism, sometimes using overlapping but also distinct aspects of extreme interpretations and pursuits of Islamic ideology:
There are two UK High Court cases that explicitly address the issue of Islamic extremism.
The judge refers to several grounds: section 20 of the 2006 Act; the definition of “terrorism” in section 1 of the Terrorism Act 2000 and the decision of the Supreme Court in R v Gul.
Begg, a prominent Muslim public figure and Imam at Lewisham Islamic Centre since 1998 lost his 2016 court case of Libel against the BBC. This case is noteworthy because the judge lists a 10-point definition of Islamic extremism that he used to determine the case:
In Charles Haddon-Cave's findings he wrote:
Extremist Islamic positions
118. In my view, the following constitute “extremist” Islamic positions (or indicia thereof).
According to some contemporary Muslim commentators, extremism within Islam goes back to the 7th century to the Kharijites. From their essentially political position, they developed extreme doctrines that set them apart from both mainstream Sunni and Shiʿa Muslims. The Kharijites were particularly noted for adopting a radical approach to Takfir, whereby they declared other Muslims to be unbelievers and therefore deemed them worthy of death.
Some of the proponents of Islam emphasise peaceful political processes, whereas Sayyid Qutb in particular called for violence, and those followers are generally considered Islamic extremists and their stated goal is Islamic revolution with the intent to force implementation of Sharia law and/or an Islamic State Caliphate.