The Bible is all parables. Jesus only spoke in metaphor, so the Old Testament is metaphor, too. God caused the Big Bang and each "day" is really a few million years - just a metaphor to help people understand creation. God created evolution.
Alternative theory is that millions of years ago, a 'day' was longer than 24 hours, i.e. the world was spinning at a different rate. No idea if scientifically that's a plausible theory, though.
The way I see it is that the Bible was written by people, not God. People, especially people thousands of years ago, don't know much and are prone to bias, misunderstanding, and (mis)interpretation. What DOES make sense to me is what Jesus said. Seriously, if you only read the stuff Jesus said, it's not outdated. Jesus was a radical ( and yes, he did exist - scriptures in different religions also reference him).
If everyone just treated everyone how they want to be treated themselves, the world wouldn't have any problems. We could literally fix the world if everyone just followed that one sentence of advice.