yes the bible does say these insane things but do people really believe this now?( except the people in the flat earth society; yes its a real thing go check it out, its pretty funny)
The best knowledge anyone can achieve is learning from their mistakes this is basically the definition of evolution. I tend to think of the Koran as a revised version of the bible removing all of the ridiculous verses in the bible and putting some of the more reasonable ideologies into Koran not to mention some of the ideologies that Muhammad had. Yes there are flaws in the Koran as well but Muhammad is human too. We all human, we accidently cut our selves when cutting food or we get into car mishaps. The moral of this story is that we all make mistakes, Jesus, Buddha, Abraham, even Muhammad makes mistakes and we should learn from those mistakes. If we don't learn from those mistakes where would we be right now?