Close Reading

Understand that I have read the Quran, Sunnah and some Hadith so I know full well that it is permitted to kill in Islam, I understand the contextual issue however you have 1 of 2 problems there\nEither all the violence and instructions to kill non-believers that are very clear in the Quran are for a different age and so the Quran is outdated and obsolete OR it is for all men for all time and so the verses instructing the killing of non-believers is valid hence these murderers are following Islam