Atheists are atheists not out of big brain but rather out of ignorance. They don't know that God and morals are the same thing. So, here is what you do when somebody declares that they are an atheist:
You ask them why don't they, when nobody's around/looking/knows, catch little kids and eat them? The reason why you don't do that is because you have a slave mentality. Somebody man made it a standard - are you a slave of this man's will? This man then made it illegal to murder and eat humans, however, when nobody's looking, you can still do it, and maybe if you did, you'd become immortal or super healthy. So, why don't you?
Now, I'm not saying you should do it. I'm asking, why don't you do it. This is a hypothetical and Dostoevsky agues the same thing.
"[T]here [is] nothing in the whole world to make men love their neighbours. [T]here [is] no law of nature that man should love mankind, and that, if there had been any love on earth hitherto, it was not owing to a natural law, but simply because men have believed in immortality. [T]he whole natural law lies in that faith, and that if you were to destroy in mankind the belief in immortality, not only love but every living force maintaining the life of the world would at once be dried up. Moreover, nothing then would be immoral, everything would be lawful, even cannibalism. [And] for every individual...who does not believe in God or immortality, the moral law of nature must immediately be changed into the exact contrary of the former religious law, and that egoism, even to crime, must become not only lawful but even recognised as the inevitable, the most rational, even honourable outcome of his position." – Dostoevsky
You ask them why don't they, when nobody's around/looking/knows, catch little kids and eat them? The reason why you don't do that is because you have a slave mentality. Somebody man made it a standard - are you a slave of this man's will? This man then made it illegal to murder and eat humans, however, when nobody's looking, you can still do it, and maybe if you did, you'd become immortal or super healthy. So, why don't you?
Now, I'm not saying you should do it. I'm asking, why don't you do it. This is a hypothetical and Dostoevsky agues the same thing.
"[T]here [is] nothing in the whole world to make men love their neighbours. [T]here [is] no law of nature that man should love mankind, and that, if there had been any love on earth hitherto, it was not owing to a natural law, but simply because men have believed in immortality. [T]he whole natural law lies in that faith, and that if you were to destroy in mankind the belief in immortality, not only love but every living force maintaining the life of the world would at once be dried up. Moreover, nothing then would be immoral, everything would be lawful, even cannibalism. [And] for every individual...who does not believe in God or immortality, the moral law of nature must immediately be changed into the exact contrary of the former religious law, and that egoism, even to crime, must become not only lawful but even recognised as the inevitable, the most rational, even honourable outcome of his position." – Dostoevsky