In this case a forgery is something claiming false provenance i.e. was written by some crafty tradesman within the last century but claims to have been found in

In this case a forgery is something claiming false provenance i.e. was written by some crafty tradesman within the last century but claims to have been found in a cave not disturbed since the 3rd century. For most of the known text we have a pretty good idea about where the earliest written copy comes from and serious academic is careful about ascribing truth to anonymous late 1st and 2nd century greek texts written in modern day Turkey and describing events happening decades earlier. Christian theologians and biblical scholars however kind of have to take 2nd century anonymous texts from people who could not have been direct witnesses to the events described as gospel value because without those accounts there is no new testament.