You asked if agnostics and atheists (two different beliefs, by the way) believe killing to be right or wrong ... etc. Christians and other religions do not own the core morality code.

Just because a person does not believe that there a God, or because a person questions whether there is a Being or not, doesn't make them lacking in the CORE moral values. Christians know the difference between right and wrong, good and evil ... yet George W. Bush, a reborn Christian, supported the death penalty in Texas ... Texas leads the nation in executions -- nearly 140 have been executed during his two terms as Governor -- but revelations of wrongful convictions among death row inmates in other states, particularly Illinois, have raised questions about the quality of justice in Texas. Bush defended his State's record, saying he is confident the State has not executed anyone wrongly convicted. No chance he could be wrong?

Of course agnostics and atheists believe there is a right and wrong when it comes to how they treat people ... because if parents (and teachers in school) are doing their job, they teach the children these things People also learn right and wrong from their life's experience ... "do unto others".

People who believe should get it through their heads that atheists are not hateful immoral people ... and that their unbelief in God is also a belief.

Some of the meanest and nastiest people I have ever met call themselves Christian.

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~ The more I am around people, the better I like my dogs ~

Humans are - by basis - social beings. By forming groups the individuals have brought themselves evolutionary benefits in the areas of cooperation and security. Still any kinds of societies requires rules to function. The moral can be explained with the social 'ruling', which has developed during the evolution. It first tells us, what we can do, but also, when to shun or hate people, when they break these rules.

The moral has brought individuals benefit, because it denies them from doing acts, which would anger the surrounding society leading to punishment, exile or even death.

The evolutionary explanation, why the instinct for judging people has developed is simple. If person has shown to be able to break the rules, he might and likely will do it again. The rules - in common - protect the personal good of other individuals in the society. Person who don't care of the rules becomes a thread towards other people. For these reasons, it is only evolutionary beneficial and wise for a person to avoid, shun or even hate a person, who - because of no 'morals' - forms a thread to him and his benefits.

And returning to the benefits of the moral - in this case - because everyone in the surrounding society feels threatened and because of the power of the masses, the immoral individual is offenly very screwed, thus pruning his genes from the population..

So simple is that..

Because of this explanation, no godly explanation for morals is required. The morals are in the most people's instincts and emotional level, and very natural behaviour.

- BtD

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"Freedom is the freedom to say that two plus two make four. If that is granted, all else follows."
[George Orwell, 1984]

You are taking away someone's universal rights, even his/her right to exist. You completely steal from them their rights, their memories, their feelings, their beliefs, their job, their hobbies, their family, everything that they have as a living being.