WOW You just proved how much of a sheep you are. If you are incapable to make your own opinion on such'You dont need a religion to tell you rape or killing is wrong' pls man, if not by religions and Prophets who else DID tell mankind this?
good/evil matters then I am sorry for you. If you need some old book from few centuries back then to tell you what is wrong or right then you should not have right to speak today. Society is constantly evolving since dawn of Homo kind and you want to tell me that they had no morals back then? You want to tell me they were constantly killing and raping and beating each other? Do you even understand what you are saying? There would be no society then. Morality might not have been that developed but saying that there were no morality before arrival of so called "world religion" is naive and do not deserve even respond lol.
Now knowing this, you should understand that religion is result of society(and its already developed morality) and not vice versa.
And so Islam is objective picture of the past and its principles of good/evil are based on era it was produced. But as society has changed/evolved/matured... perception of what is right/wrong has changed as well, but obviously not in quoran. So stoning someone might have been fine back then but it is not today.