The p52 fragment is without question from the Gospel of John. Dating it to 125 AD puts the claims sometime before that. That pushes the claims very close to the events, not centuries after.
Jason, no one is disputing that. What is in question though, is the Bible. There is little doubt that the Ryland fragment is part of the Gospel of John, it is not at all certain just what the Gospel of John was. One thing that is known, based on the existing copies of various books and gospels is that there were various versions of most being circulated. Even the finally accepted copies of the four gospels tell slightly different stories except where it is apparent that sections were coppied from an earlier work.
So the story of Jesus, as told in the early Gospels is not uniform. In the Gospel of Thomas, for example, an entirely different version of Jesus is portrayed, one that is far closer to the Gnostic tradition than that of John.
While you simply dismiss the suggestion to look at the Lives of the Saints, it would be productive. There you will see that in far less than 70 years, stories every bit as amazing as those told about Jesus rise up and take firm hold. They will show that a legend can even be created within the lifetime of the individual, far less than 70 years.
Aslan is not a Tame Lion