Anyone who follows the Bible literally is an idiot because you have cultural relativism into play. All of those teachings while relevant in the respective society that was taught in, should not be viewed literally in contemporary society.
That's basically saying that things that were written into the bible were considered moral by the people they were written, even if they were "inspired by god." But with time, we as people realized ourselves that those things are not actually moral, despite the bible and "god" telling us they are. So if we can figure out what's more moral than what god tells us, and are rejecting his version of morality already, then why do we need god?