The Fall of Adam and Eve

I'm just really, really curious. Why do you have 5% of your salvation left to earn if you're already sinless? They believe that second generation are born without the original sin. So they, they, oh, so you can still commit actual sins in them. And then she was, she had this kind of original sin from Satan himself and then she passed that sin on from herself to Adam,. by subsequently having sex with Adam.