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Islam renounce the killing of innocent people
this however does not prevent some muslims killing innocent people.

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What do you think war crusade.
Is the killing of innocent people in the name of religion or not?
if you care too would you like to elucidate on "war crusade". Historical or present day?

Although whichever your choice as a Christian I would have to say any war or conflict in the name of God is wrong. Why would God wish us to fight each other in his name? No logical reason to suppose God would wish this. Whatever supposed justice we dispense to each other during our time on this earth counts for nothing as God is our ultimate judge. That's why I have no problem forgiving a person who has wronged me as I know that God will pass divine judgement upon them anyway if they have sinned, so there is no need for an eye for an eye justice, like you hurt me I hurt you back..it is so pointless. It can only ever escalate into violence and hate.