How does Islam impact morality?

I read in an answer to another question that you do not need religion for morality and that without religion it is not like you are going to be raping or murdering. So how does Islam change morality and what is the difference between an atheists morality and Islam’s? https://islam.stackexchange.com/questions/12200/do-we-need-religion-for-morality-morality-without-religion?r=SearchResults In which way is the morality we have in Islam better than that of the morality of the atheists or other religions?