Islam uses 'keywords' to describe those who should go to the Hellfire, or be tormented in this lifetime; or who should be executed, crucified, and humiliated. The key words used would include those who commit injustice, are unfair, steal, lie, deceive, create social discord, practice polytheism [eg. Christianity], worship false idols [the Jews], are criminals [all non-Moslems], or who do not support the Umma or community with tax payments, hospitality, and reverence.
The ugly fact about the Koran and Islam is of course that anyone who does not follow the Muhammad, or the Allah [both of whom can be considered in their Koranic context to be the same]; are all of the aforementioned apellations. The cult rules. If you are outside of the cult, you are a criminal polytheist and instigator of social dislocation. These facts have to be kept foremost in mind when reading the Koran. As 4:30 and 4:92 both state, you must never kill a Moslem [but killing an infidel is fine]:
30:O you who believe! Eat not up your property among yourselves unjustly except it be a trade amongst you, by mutual consent. And do not kill yourselves (nor kill one another). Surely, Allah is Most Merciful to you.
And
92:It is not for a believer to kill a believer except (that it be) by mistake, and whosoever kills a believer by mistake, (it is ordained that) he must set free a believing slave and a compensation (blood money, i.e Diya) be given to the deceased's family, unless they remit it. If the deceased belonged to a people at war with you and he was a believer; the freeing of a believing slave (is prescribed), and if he belonged to a people with whom you have a treaty of mutual alliance, compensation (blood money - Diya) must be paid to his family, and a believing slave must be freed. And whoso finds this (the penance of freeing a slave) beyond his means, he must fast for two consecutive months in order to seek repentance from Allah. And Allah is Ever AllKnowing, AllWise.
Compare this sentiment with verse 4:56:
Surely! Those who disbelieved in Our Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) We shall burn them in Fire. As often as their skins are roasted through, We shall change them for other skins that they may taste the punishment. Truly, Allah is Ever Most Powerful, AllWise.
Sura 4 makes profoundly disturbing reading. Like the other long Suras a good part of it is little more than rants of violence against those who are not Moslem. This cultural artefact of the Koran must surely distort the culture of the Moslem cult. To deny this is to be purblind on a vast scale.