Like your title, a mad mans ravings have little substance. Killing a human being is the most heinous crime be it be any religion. Quoting the Holy Quran: "...Whoever kills a soul unless for a soul or for corruption (done) in the land - it is as if he had slain humankind entirely. And whoever saves one - it is as if he had saved humankind entirely." [Surah Al-Maidah 5:32]
So Allah tells us in the Qur'an that if any human kills any other human, whether it be a Muslim or Non-Muslim, unless it be for murder or for creating mischief in the land or for creating FITNAH or FASAAD in the land, it is as though as if he killed the whole of humanity. (Allah doesn't say that only if you kill a Muslim, it is as though as if he killed the whole of humanity).
And if anyone saves any other human being, whether Muslim or non-Muslim, it is as though as if he saved the whole of humanity. This is what this glorious Book proclaims, and people allege that it is the source of violence, the source of disruption of peace! Those who wish to continue with and perpetuate their injustice, tyranny, oppression and falsehoods say such a monstrous lie and calumny.
