Islam is “religion” based on cruelty to the unbeliever. Unbelievers can be other Muslims from other sects of Islam or non-Muslims. Muhammad was a child rapist, slave trader, slave master, sex slave trafficker, kidnapper, genocidal mass murderer, blissful torturer, thief and liar. This and more is well documented in the Koran and Hadith.
The Muslims joining ISIS are just Muslims wanting to be “Good Muslims.†They want to follow the way of their prophet. In the exact way Muhammad lived and ruled. No amount of sugar coating or mumbling about “moderate” Muslims will change that. “Radicalized” Muslims are simply Muslims who want to be “Good Muslims” in their host country according to the very same Koran and Hadith.
Muslims must turn from their evil beliefs and accept the teaching and salvation of Jesus as their Lord and God. There is no other way open to them.
The interpretation of the Koran is VERY literal, and any of the verses which preach love and acceptance of other people are abrogated by the verses which takes the dictates to convert, enslave or kill the ones who do not believe in the primacy of Allah (definitely a very different deity than that of either the Torah or the Old and New Testaments) very seriously. There is no equivalent of either the Ten Commandments or the Golden Rule in the Koran.
“Moderate” Muslims seem to be capable of becoming “radical” Muslims on a moment’s notice, and in response to the most insignificant of slights. The Sudden Jihadist Syndrome seems to be part of just about every sect among the Muslims, and it is as easily triggered against another Muslim whose faith seems to be “not strong enough”, as it is to any infidel.
There is a subset of Muslims known as “Sufis”. Sufism is a Muslim movement whose followers seek to find divine truth and love through direct encounters with God. Sufism arose from within Islam in the 8th-9th centuries C.E. as an ascetic movement. The movement may have been given (or taken on) the name Sufism because of the course wool garments they wore as a mark of their rejection of worldly things; Sufis have traditionally taken vows of poverty and celibacy.
And they are targets of the Sunni and Shi’ite sects, for not sufficiently “religious” in applying the more violent parts of the Koran.