Dear Mr. Cornwell:
Hello. I haven't read your Arthurian series, but maybe someday I will. In the meantime, I wish to politely challenge you on two related fronts.
(a) You mention several times in the FAQ section that the ancient (British) church was anti-Arthur. Now at one point you refer to that institution as "the early church," which is a misnomer because ordinarily in history circles the term "early church" refers to the pre-Augustinian, Middle East-based version of the Church. Technically speaking, "early church" doesn't apply to the British Isles.
Regardless, there's another problem here: even within the lifetime of the Apostles, this or that local church went theologically or ethically off the rails (see especially Galatians and 1 Corinthians, as well as Revelation 2-3). Just because the Celtic church was "anti-Arthur" _doesn't_ mean we should conclude that Arthur was pagan - anymore than Charles Martel was pagan despite incurring the ire of the institutional church when he commandeered some of their supplies to help him maintain his war against the invading Muslims.
It would be surprising if Arthur hadn't done the very same thing, which would have engendered the very same response Martel got. But a genuine Christian could _easily_ (and oft-times has been) temporarily at odds with the institutional church. The Bible makes it abundantly clear that the institutional church isn't immune to corruption, and doesn't have inherent authority to determine who is or isn't a genuine Christian. That's defined by the authority of Scripture itself. All Christians can do is proclaim what Scripture teaches. We have no authority of our own.
I challenge you to find any ancient church record (or supposed record) wherein priests or monks opposed Arthur on _theological_ grounds.
(b) You've said that despite being "raised Christian," you eventually "escaped into disbelief." Well, in fact, no you didn't. You exchanged one belief-system for another. Nobody is "free" of belief. Nobody is "free" of a worldview, a metaphysic. You have one, as surely as Christians do.
The question is: Which worldview has more going for it...?
Best regards,
Andy Doerksen