I've read that in Islam it is a greater sin to kill a Muslim than a non-Muslim.
However, on death a Muslim will be in Paradise whereas the non-Muslim will be in Hell.To kill a non-Muslim is to deny them forever the chance of becoming a Muslim, and condemns them to Hell. Is this not then a greater sin?
Praise be to Allaah.
Killing a non-Muslim when he is a mu’aahid (one of those who have a peace
treaty with the Muslims) is a sin, one of the major sins. Al-Bukhaari
narrated that ‘Abd-Allaah ibn ‘Amr ibn al-‘Aas (may Allaah be pleased
with them both) said: “The Prophet
(peace and blessings of Allaah be upon him) said: ‘Whoever kills a mu’aahid
will not smell the fragrance of Paradise, even though its fragrance
may detected from a distance of forty days.’” But with regard to non-Muslims
who are at war with the Muslims and do not have a peace treaty with
the Muslims or are not living under Muslim rule, then Muslims are commanded
to kill them, because Allaah says (interpretation of the meaning):
“Fight those of the disbelievers who are close to you, and let them find harshness
in you” [al-Tawbah 9:123]
But this should be in the case of jihaad under the leadership of one of the
leaders of the Muslims, or his deputy.