[tjoff]

I find that argument similar to "without religion what stops you from murder and raping people?"

The absolute knowledge that free will doesn't exist doesn't really change much at all. It might give you a different outlook and, optimistically, a better understanding of different viewpoints.

If you are absolutely contempt to sit on the couch for the rest of your life nothing stops you from choosing that in a free-will world. Most of us would be bored and will try other ways to entertain our self. Whether that desire is founded on free will or just a predetermined evolutionary trait doesn't really change the outcome.

You believing in free will or not is quite irrelevant compared to the impact your surrounding has on you. It is even your surrounding that forms the basis of your belief in the first place.