Was Jesus a false prophet?
If not, then when and where did Peter die, and how do you know? I ask because it's not likely that the early Christian church would simply have forgotten where and how Peter died, especially since it was prophesied in Scripture. It's not likely that that knowledge would have been silently replaced by a myth, either. The ancients weren't quite that stupid, cowardly, or gullible.
And the memory that the early church left us about Peter's martyrdom is crystal clear: he was crucified upside down in Rome during the reign of Nero. If you disagree with that, show us your evidence -- keeping in mind that your story either must end with Peter's martyrdom, somewhere and somehow ... or must conclude that Jesus is a liar.
Except that the 'history' of Peter's death wasn't recorded until the 4th century if I'm not mistaken. The rock Christ spoke of was faith, not a man.