I was recently dialoging with a skeptic who said Jesus didn't teach original sin anywhere, and that this is an invention of Paul. How would one best respond to this argument? Is there any statement of Christ's that directly teaches or implies original sin?
Since it is acknowledged that Paul taught the doctrine, the direct route is to show the authority of the apostle Paul, as others have said. If the apostle's authority is rejected there could be no basis for believing anything about Jesus for the simple reason that everything that is known about Jesus comes to us through apostolic writings.