Antonio Matteo I will answer the question as best as i can. Why does the Quran says to kill Jews, Christians, and infidels?
There are reasons Quran says Muslims to kill Jews, Christians and Infidels. But, the problem was that most Muslims as well as Non-muslims qoute the scriptures out of context plus without reflecting on the exegeses as to what, why, when, how who and whom behind each verses. Just as the same way the concept of modern education was a misconception and is based on indoctrination of students instead of the original greek concept of education which was based on inspiration of students.
Yes Quran ordered the Muslims the killing of jews, christians or infidels, but why?
These verses applied to not only jews or christians but to muslims, pagans and atheists who have been proven to have commited an act of treason of his or her country which he/she solemnly pledge to protect, who committed adultery, who waged wars on innocent humans the likes of Hitler and Imperial Japan, who raped, kidnapped or killed innocent lives and who not only apostated his/her own religion but also blaspheme it.
Here are the Quranic verses that said to Kill Jews, Christians and Infidels that do the above wrongful acts…..2:191 , 23:28 , 3:85 , 5:33 , 8:12 , 8:60 , 8:65 , 9:5 , 9:30 , 9:123 , 22:19 , 66:9, 47:4 , 68:4 , 33:21, 5:13, 65:4, 9:29, 9:73, 9:1234… and In Sahih Bukhari 7:62–88 , 6–298 and also in Sahih Muslim 1:30, 31:5917 amongst the few verses
Mind you, those verses not applicable to jews, christians, muslims, pagans or atheists who were innocent of any of those crimes. Killing innocent people regardless of any religion is an unpardonable punishable crime in Islam. The likes of ISIS member committed suicide in a busiest place killing innocent lives because the ISIS member feel the people non Muslims thus infidels, or in the case where a Muslim brotherhood allegedly raped innocent non-muslim lady in briton because he felt she’s a non-muslim and that may likely be whore after all, are totally forbidden in Islam. Where was it said all non-muslim ladies were whores and who say all non-muslims were infidels and shouldn’t live. If not terrorists! If Allah so wish for Muslims to erase non-muslims from the surface of the world, then why did Allah have to create non-muslims for the first place? Allah would’ve done a better job creating only the muslims without non-muslims. This proven that people with such mindset were terrorists (wrong-doers).