How do theistic evolutionists view the Fall of Man?

I haven't really decided what to think about the creation of the world. I'm very familiar with the concept of evolution, scientifically, and if I didn't believe in God I'd certainly believe in evolution. However I'm not sure about the theological aspects of evolution. I consider the Fall of Man to be very important in Christianity. If man didn't fall, the "sinful" behavior would have actually been built into us by God (or God's mechanism). It would be difficult to explain how we're responsible for our actions, then. At least that's the way it feels to me. Now, I'd like to know a few things from a theistic evolutionism point of view. If there are many different views, please tell all that fit with the assumption of evolution. 1. Was the Fall of Man a historical event? 2. Is the description of the Fall in Genesis 3 literal? 3. (\*) How come we are accountable for our deeds? 4. (\*) Where did original sin come from? (or does it not fit with theistic evolution) (\*) *If you think the Fall wasn't historical* **EDIT:** question number 4 was added afterwards.