The piety of "having a personal relationship with Christ" ... is alien to the New Testament... but evangelicals elevate it to the shibboleth of salvation! Unless you have a personal relationship with Jesus, buster, one day you will be boiling in Hell. Sheesh! Talk about the fury of a personal savior scorned!
"You ask me how I know he lives?" asks the revival chorus. "He lives within my heart." Exactly! A figment.
If, when we compare two versions of a story, the second known to be a retelling of the first, and find that the second has more of a miraculous element, we may reasonably conclude we have legendary (or midrashic or whatever) embellishment. The tale has grown in the telling. This sort of comparison is common in extrabiblical research and no one holds that it cannot properly indicate legend formation there.
I do not expect that the mere fact that I was once an evangelical apologist and now see things differently should itself count as evidence that I must be right. That would be the genetic fallacy. It would be just as erroneous to think that John Rankin must be right in having embraced evangelical Christianity since he had once been an agnostic Unitarian and repudiated it for the Christian faith.
"Heresy," by the way, simply means "choice." It came to mean "thoughtcrime," implying it was blasphemy to presume to choose your own belief instead of swallowing what the bishops spoonfed you.