Northrop Grumman B-21

[Wyrd of Gawd]

If everybody believed that "killing" another life, will get them to burn in pit called hell, if everybody knew the consequences of crimes like stealing, robbery (btw big banks and big companies do it everyday and because of it: wars spark everywhere).

No.  If everybody believed that 'killing' another life would make them 'burn in hell', then you would change absolutely nothing.  You'll have changed absolutely nothing, because if it takes fear of punishment to make people realize that killing civilians is a bad thing--then you've based your morals on punishment rather than actual consequences.  And when you do that you ultimately make that punishment useless.  You toss them out, and the religious just justify their actions.  "We're fighting the good fight.  We're doing it for all the right reasons.  To protect people.  God wants us to do this."  That's what you get when you base your morality on punishment rather than actual real consequences.  Almost anyone can rationalize their way into heaven.  They'll be forgiven because they were doing it for their god.  They were doing it for 'good' reasons. 

The true measure of someone is when nobody is watching them.  If it takes someone watching to make them do good, then they aren't really good.  And as soon as they either think nobody is watching or they can rationalize their actions to their 'god', then they won't be what we can define as 'good' by any measure of the definition.

Since civilians fund the war machine there's nothing wrong in killing as many of them as possible during a war.  They are a couple times more dangerous than their military is.