That is absolutely NOT true. Humans FELL when they disobeyed and they fall every time they do so personally also... so we are a MESS.
Baptism cleanses us of original sin. When a person gets into a car wreck and is seriously injured, has to go to the hospital, etc... it takes a lot to get that person... say, out of a body cast and at least somewhat back to what the person once was, health-wise. It is the same with this original sin that screwed us up... It is worse than people realize... and even after baptism, obviously, we have this bent to sin... All we need to prove that is to look around at all the sin and its horrible consequences, seen all around us