As for Ignatius, well, you can start for example here:
http://www.bible.ca/history-ignatius-forgeries-250AD.htm
There's actually a lot less than a consensus that they're authentic. The Catholics want to make them authentic (and btw, it's the LAST seven, not the first) because they suspiciously endorse exactly the kind of organization they came up with later, plus an endorsement by name of the Catholic Church. (Which is one WTH, as there is no evidence that anyone used that term until much later.) But really, their
whole argument boils down to "we can be sure 8 are forged, therefore the other 7 are genuine." That's it. There is no evidence that anyone had even heard of them until the mid-3'rd century, which is weird for some letters addressed to bishops all over the darned place, or really anything that would count as evidence for their being genuine. It's just those that aren't proven to be fakes.
Which is a bit thin as support, wouldn't you think?
Plus his story is really tripping suspension of disbelief.
We're talking a guy who, without even being a citizen, simply demands to talk to the Emperor Trajan while the emperor is going with the army through Antioch to fight the Persians. And actually gets to talk to Trajan, just because he asked. That's the first WTH.
... apparently for no other reason than to profess his Christianity (WTH?) and is promptly sentenced to be torn by wild beasts for being a Christian. Which is yet another WTH, since there are no records of persecutions against Christians by Trajan at that time. In fact, it would only be 2 years later that Pliny the Younger starts persecuting Christians in Anatolia (and actually at exactly the other end of Anatolia than where Antioch was), and Trajan actually asks him not to actively seek out Christians, and to not follow anonymous tips. But OK...
... and supposedly this Ignatius was actually hoping he'd be executed, or at least seems glad that he is sent to his execution. Not really the most stable person, but ok...
... except instead of just executing him on the spot, like Pliny and really everyone else did, Trajan sends him to be executed in Rome. For no obvious reason, really, since Trajan was going in the other direction. Ignatius isn't even going to be part of some show Trajan will be at, so WTH?
Seriously, WTH? Trajan wasn't into shows of repression, and even as a warning, executing him locally would have sent a more valuable message to his local followers. Why Rome? Why not the local arena in Antioch? Or Ephesus, which is actually on the way they supposedly followed?
Don't you think a more plausible scenario would have involved his going a whole 100 yards or so to the nearest execution place? And good luck writing fast enough to produce 7 long rambling letters in that time.
... and this trip turns into a sort of a band tour, as instead of just going to Rome, they haul the guy all around a quarter of the mediterranean coast, spending a couple of days in each major city along the way, letting him write letters, meet with local elders, etc. This guy is pretty much paraded like a super-star, not like a convict in chains.
... his own account -- in as much as I can say "own" about a forgery -- paints this surrealistic picture: "
From Syria even to Rome I fight with wild beasts, by land and sea, by night and by day, being bound amidst ten leopards, even a company of soldiers, who only grow worse when they are kindly treated" That's page 5 from his epistle to the Romans.
WTH? Does that sound even remotely plausible? So now not only he's sent by Rome, but they make him fight wild beasts all over the place, and even while on sea, and even keep him chained amidst ten leopards. Do you really think that someone could actually survive such repeated fights with ten leopards, until they find lions in Rome, which are apparently his nemesis because they do finish him off? Also, do you think the leopards would just sit and let him write?
So basically if it's not a forgery, then good ol' Ignatius is a liar. He's inventing his own pious martyrdom fiction.
... then there's the curious fact that, for someone who supposedly was pretty much THE second pope, and who obviously remembers to write when he's hauled to his execution, there is no mention or letter of him before that.
Which is really curious. He paints a totally ahistorical image, of churches subjected to one bishop who rules them all with an iron fist like Sauron, and whom you should obey like he IS Jesus Christ... yet we just don't see him do what it would take to achieve that. (Nor achieving anything resembling that great unity.) Where are the letters to churches to bring them under his authority? Where are his rulings on matters of theology? Where are the epistles admonishing against heresies? Don't you think he should have written some before being hauled to his execution, if he actually was the second pope?
It's only after he is taken to his execution, that suddenly a bunch of letters appear in his name.