Nice thread, Phlethon.
I'm a little concerned at some minor parts though.
Why they at times feel the need to mention Wicca in the same sentence as the ancient beliefs of the Celts or even speak of modern "Druidism" without so much as a sneer, makes me almost as uneasy as the addition of modern symbols which almost certainly have no significance to the ancient culture/people being discussed.
The biggest disappointment is the dismissal of human sacrifice as a reality, claiming it as only being mentioned by Caesar (a biased source) and then being taken up by unscrupulous Christians later on in order to discredit the ancients pagans.
This is simply not true. Numerous mummified remains have been unearthed which have shown not only very persuasive signs of ritual murder but also remarkable similarities to the "triple-fold killing" mentioned in the ancient Irish texts. It is a bit too much of a coincidence to suppose dishonest monks made up slanderous stories of human sacrifice and then millenia later corpses suddely turn up showing pretty much the exact signs of such deaths as were described. The truth is that the monks may have embellished stories or put on them a Christian veneer over the top of them. But to claim they fabricated lies and calumnies is rather ridiculous imo. These men were still borne of the same culture being written about, a culture obsessed with preserving the facts accurately. It is insulting to say they would have done otherwise.
It is disappointing when genuine historic facts are tainted & distorted by glaringly obvious neo-pagan bias.