If you follow the literal contents of the books you end up with the 10 commandments and good luck imitating God's killings without being God (a capital sin justified with a sin? sorry, it's downstairs for you).
If you follow the literal contents you also assert you understand them 100% which is quite a feat, but never mind that.
If somebody wrote books like those today, he'd find himself in the same position as the Mohammed guy, where his assertions would either be questioned or used, if fitting some powerful interest's agenda.
So if you blame Mohammed instead of those interests, you make a great favor to those interests because they can change their ideology as easily as you can buy a pair of shoes.