The big problem with the view in the link given is the same problem that I encounter with simmlar views expressed by new religions that emerged during the mid to late 19th century, and attempt to use the so called “Great Apostasy” theory to legitamise their particular view.
And that is that they portray early christianity as totaly isolationist or in other words as not being capable of understanding and even appreciating the great minds of antiquaty, nor being sufficently subtle in wisdom and reasoning to empathise and discourse with non christian peers of their time.
To me this view often reflects the view of the founder of the new religion that is trying to use this particular theory to gain leverage. Take for example Charles Taze Russell the founder of the Jehovah Witnesses who also drew heavily on the great apostay theory in an attempt to legitamise his view. According to his point of view every learned christian from St paul to the present day and this includes all of those devoute and holy doctors of the church got it wrong, i.e they completly missed the message of Christ and the gospels.
According to this view the founder of the new religion is the only one who has got it right, and is correctly following the teachings of Christ since the time of the appostels.
Buying into these accounts of the great apostosy, and being drawn into the teachings of these new religions takes the new recruite into a world where history and language no longer have any meaning, they are manipulated and morphed into new forms and become tools to serve the agenda of the particular movement instead of remaining as reliable guide posts which can be used to assess the often outlandish claims of the charletons and confidence tricksters, claiming to be some one great (Acts 8:9), that have exsisted side by side with the one true church since the time of Simone the Magus.
All of these so called accounts of the the “Great Apostasy” read the same, on the surface they appear well researched and even credible however upon closer examination they completly fall apart. The main problem, that they all seem to have in common, is that the author takes a short space of history for example in the above link 313 to about 325, this period is removed from all context, as if this space of 20 years or so exsisted in a vaccume removed from all other social, poltical, cultural, historical, philosophical, economic and geographical influences of it’s time, and once placed in this rareified atmosphere the author then procedes to builed up his or her argument seemingly using any means available, jumping backwards and forwards through history without any regard for context or events, selectivly quating from any obscure source that can be used to support their views, dissmissing all other credible sources that are in contradiction to their views, and on and on it goes.
Come on “Give me a break”. This sort of crank so called “research” belongs in the same catagory as the “They never landed on the moon” conspiracy theorists.