Why do you think that some people will be prepared to kill another human being for their religious beliefs, or at least feel an element of sympathy toward the killer of another person, specifically if it is in the name of "
insert a god here".
I think it falls into the whole concept of, who is doing what for a good cause etc. Then one needs to define good, and we as muslims know that revelation from God is required to figure out what is good/bad etc., especially in areas where mankind differed.
Religious beliefs and faith have a lot to answer for the part they play in the murderous history of the human race, in my observations.
That's not totally true, not in all cases anyway. Yes, there are people who will use religion to justify their actions, however - these exact actions that the people do aren't really part of the religion, therefore we need to look into the religious texts to verify whether what the person is calling to is good or not.
I.e. In the context of war - killing of innocents isn't permitted in Islaam, nor of women, children, seniors, those who worship in monasteries etc. It is only a fight against the combatants, and the reason for that is to allow people to have their rights without transgressing others, or harming society as a whole.
I.e. In an Islamic rule:
Since the Islamic legal injunctions are aimed at achieving human welfare, they can all be referred back to universal principles which are necessary for human welfare to be secured. These universal principles are:
1. The preservation of life.
2. The preservation of religion.
3. The preservation of reason.
4. The preservation of lineage.
5. The preservation of property.
The Islamic penal system is aimed at preserving these five universal necessities. To preserve life, it prescribes the law of retribution. To preserve religion, it prescribes the punishment for apostasy. To preserve reason, it prescribes the punishment for drinking. To preserve lineage, it prescribes the punishment for fornication. To preserve wealth, it prescribes the punishment for theft. To protect all of them, it prescribed the punishment for highway robbery.
It should therefore become clear to us why the crimes for which Islam for which the Law has prescribed fixed punishments are as follows:
1. Transgression against life (murder or assault).
2. Transgression against property (theft).
3. Transgression against lineage (fornication and false accusations of adultery).
4. Transgression against reason (using intoxicants).
5. Transgression against religion (apostasy).
6. Transgression against all of these universal needs (highway robbery).
http://www.islamicboard.com/basics-islam/1557-crime-punishment-islam.html
Mankind has been given the 5 senses to get a basic understanding, then man has also been given logic by God, but that isn't sufficient. Because with these attributes, man still required something which will help them come together on a common ground. If they don't have common ground, then they will differ, they will dispute, argue, fight, and humanity will fall into chaos and destruction.
So divine revelation is required by the One who created us in order for us to truelly know the difference between good/bad, wrong/right etc. And if we don't have this, then the oppressors will remain oppressors, and the oppressed will remain oppressed.