There have been a number of threads on here about the doctrine and how silly it is, i.e Farkel's excellent "Original sin for Dummies"
But my question is concerning how they justify taking the doctrine on board.
They reject the Trinity Doctrine on the basis that, although many scriptures can be used in support of it, it was a doctrine formulated long after the death of the Apostles.
The doctrine of Original Sin, though begun by Iraeneus in the second century was not fixed until Augustine of Hippo wrote about it long after the Trinity was an established belief. A belief Augustine accepted on his conversion to Christianity.
So, although the same method as for the Trinity can be used , scriptures which seem to support it, it is a very late developer as a doctrine.
So why, when not all the Christian Church, and certainly not Judaism or later Islam adopt the doctrine, why do JW's when it comes from the "Apostate" ( from the WT teaching) Augustine of Hippo ?
Why absorb a 3rd century doctrine and claim to be following primitive Christianity ?