Why is the world suffering from Islamic terrorism?

Islamic terrorism, sometimes referred to as Islamist terrorism or radical Islamic terrorism, is the term used to describe acts of terrorism committed by militant fundamentalist Islamists and other Islamic extremists that have a religious basis.  Al-Qaeda, an Islamic terrorist organisation, was responsible for the September 11 attacks on the United States in 2001.

Eight countries with a majority of Muslims have seen the most incidents and deaths from Islamic terrorism (Afghanistan, Egypt, Iraq, Libya, Nigeria, Pakistan, Somalia, and Syria), while 74% of all terrorist deaths in 2015 were attributable to four Islamic extremist organisations (Islamic State, Boko Haram, the Taliban, and al-Qaeda). The annual toll of terrorist acts increased significantly between 2011 and 2014, when it peaked at 33,438; it then dropped to 13,826 in 2019. 

Islamic extremist groups use their interpretations of the Quran, the hadith, and sharia law as justifications for assaults on civilians. These include the need to carry out armed jihad in retaliation for perceived injustices committed by non-Muslims against Muslims; the conviction that many self-declared Muslims must be killed because they have disobeyed Islamic law and are unbelievers (takfir); the absolute necessity of restoring and purifying Islam by enforcing sharia law, especially by restoring the Caliphate as a pan-Islamic state.

In their book, The Age of Sacred Terror, Daniel Benjamin and Steven Simon make the case that Islamic terrorist attacks are driven by religious zeal. As 'a sacrament... intended to restore to the universe a moral order that had been defiled by the enemies of Islam,' they are thought of as such. Their attacks serve as a 'act of redemption' intended to 'humiliate and slay those who defied the hegemony of God,' rather than being political or strategically sound.

However there's still doubt between the link of a religion an the terrorism that is spreading in the world rapidly like a fire. Terrorist acts are incompatible with Islam, according to a number of Shi'a and Sunni traditions that the Prophet of Islam (s) is cited in. The Prophet of Islam (s) is reported to have remarked, 'The faith (i.e. Islam) has handcuffed assassination, a believer does not get engaged in terrorist actions,' in a renowned hadith transmitted by Shi'a and Sunni narrators. [Abu-Dawood, al-Sonan, Hadith 2388, Al-Majlesi, Beharul-Anwaar, vol.28, p.359] Islam has explicitly condemned terrorism both practically and philosophically, as evidenced by the Prophet Muhammad (s), his pure descendants, as well as his companions and the companions of his companions. Perhaps if the Imam Husain (a.s) ambassador in Kufa had killed Ibn Ali instead of himself, the catastrophe of Karbala would not have happened.