While there are most certainly passages in the Qur'an that justify killing, it should be noted that there are also many passages in the Judeo-Christian Bible that justify killing in gods name.
Judeo-Christian teachings justify the killing of your children for insubordinance.
"If a man has a stubborn and rebellious son who will not listen to the voice of his father or his mother even when they punish him his father and mother must take hold of him and bring him to the elders at the gate of his town. They shall say to the elders, 'This son of ours is stubborn and rebellious. He will not obey us. He is a glutton and a drunkard.' All the men of the town must then stone him to death. You must banish this evil from among you." (Deuteronomy 21:18-21)
Judeo-Christian teachings justify the killing of your homosexuals.
"If a man has sex with a man in same way as with a woman, they have committed an abomination. They are certainly to be put to death. Their blood is on their own heads." (Leviticus 20:13)
Judeo-Christian teachings justify the killing of rape victims.
"If, while in a town, a man happens to meet a woman who is engaged to be married and he has sex with her, take them both to the gate of the town and stone them to death: the girl, for not having cried for help in the town; the man, for having violated another man's wife. You must banish this evil from among you." (Deuteronomy 22:23-24)
Judeo-Christian teachings justify the killing of prisoners of war.
"When you go to war against your enemies and you take prisoners put the entire male population to death." (Deuteronomy 21:10)
Judeo-Christian teachings justify the killing of anyone who tries to introduce you to other religious beliefs.
"If your brother, or your son or daughter, or your beloved wife tries to secretly entice you, telling you to go and worship other gods, gods of people living near you, or far from you, or anywhere on earth, do not listen to him. You must kill them. Show them no pity. And your hand must strike the first blow." (Deuteronomy 13:6-9)
Judeo-Christian justify the killing and complete destruction of any community that worships other gods.
"If you hear that in one of the towns, there are men who are telling people to go and worship other gods, it is your duty to look into the matter and examine it. If it is proved and confirmed, you must put the inhabitants of that town to the sword. You must lay the town under the curse of destruction, the town and everything in it. You must pile up all its loot in the public square and burn the town and all its loot. That town is to be a ruin for all time, and never rebuilt." (Deuteronomy 13:13-16)
And, for the record, Jesus made it perfectly clear that his teachings in no way rendered Moses' Laws obsolete.
"Do not think that I have come to abolish the Law of Moses or the Prophets. I have not come to abolish them, but to fulfill them. In truth I tell you, until heaven and earth pass away, not even the smallest stroke of a letter will pass away from The Law. So anyone who breaks the least of these commandments or teaches others to do so will be called 'least' in the kingdom of heaven. But whoevever practices these commandments will be called 'great' in the kingdom of heaven. I say to you that unless your righteousness surpasses the experts in The Law, you will certainly not enter the kingdom of heaven." (Matthew 5:17-20)