During the 17th century the Scots coined the term "Blessed Blend" to describe the marriage union between a Celt and a Native.
Really? Never heard it myself. And 17th century? There were enough Scottish people in America in the 1600s who were (consensually?) inter-marrying with Eastern Woodland tribes to have a term coined for it? And a term that none of my family, friends or relatives from Scottish/Cherokee and other related heritage have heard of it?
A lot of the "Mighty Gaels were the same as Indians" stuff is based on Hollywood stereotypes of both cultures. Racist "Last of the Mohicans" fiction. Yes, the ancient Irish and Scottish cultures, being warrior cultures and (in the pre-Christian era) animistic, have some striking similarities to some of the cultures of the Americas. But those are the sorts of things you find in most warrior/animistic cultures, and not really the stuff he lists there.
I don't know, it sounds more like the superficial lumpings people do when they want to do a salad-bar neo-religious approach. It sounds predominantly Christian, and they may be nice enough people, but they don't seem to know much about history or the issues in the Modern Celtic Nations. I did get a laugh out of how, on their MySpace page, they said one of the Celtic Nations is called... "Cromwell."
Those who know Irish history can either laugh, cry, or roll over in their graves at the egregious nature of that one.