Doug Mason,
Not wanting to be confusing about this subject, I was merely quoting the scripture that most 'so-called' Christians use to 'prove' the doctrine of original sin. Since I consider myself 'boderline agnostic' I don't look to the Bible as a final authority on the human condition or the future of humanity. I never looked to see which Psalmist wrote this and so I don't really know. Some Jewish scholars do indeed teach that there is no such thing as original sin and that the Hebrew scriptures contain no such doctrine. However, there is no hard and fast agreement that St. Augustine coined the phrase or created the doctrine of original sin. Perhaps this website will be of interest to you. I don't know how reliable it is but it adds to the discussion. http://unamsanctamcatholicam.blogspot.com/2011/10/st-augustine-did-not-invent-original.html
Sparky