How to Spot a Fake Gospel
Here are the many reasons why fraudulent "gospels", are easily identified as such, despite claims of "authentication".
1) Fraudulent gospels never widely circulated, like the New Testament (NT) manuscripts were. Since the manuscripts of the NT were widely copied and circulated, we have 24,000+ portions, manuscripts, and minuscules of NT parchments. For fraudulent gospels we have, 1 a.k.a. "one" or "uno". It could have been an essay for some rich guy's creative writing class for all we know.
2) We have 36,000+ letters written by Christians to each other before 325 AD which quote parts of the NT. NONE of those quote fraudulent gospels. Not a one. Authentic Gospel manuscripts were widely quoted as the beloved Word of God. We also have authentic early Christian writings which quote the New Testament.
3) These fraudulent gospels normally make historical, geographic, linguistic, or textual blunders which expose them as the frauds they are.
If I tried to pretend I was from New York, the linguistic blunder of my California accent would give me away. Fraudulent gospels claim to be written by early 1st century biblical characters, but use 2nd or 3rd century Greek. Not bloody likely.
If I was from Australia, and tried to pretend I was an American, I would instantly expose myself a fraud by me mentioning the 30 minute drive from Hollywood California to the New Jersey suburbs ... which are 3000 miles away.
If I were trying to falsely pass myself off as an expert of the 20th century, and I told you how I was playing with my Playstation 4 video game console when President John F. Kennedy was shot, that would be a historical blunder that would expose me a fraud.
If I were to tell you I was an expert on the life of John Lennon, and told you that Lennon's 2nd wife was Yakko Oboe, and not Yoko Ono, that would be a textual blunder that I would not make under God's inspiration.
Blunders like these examples, make it obvious that whoever wrote it is trying to pass off what you're reading as authentic, when it's not.