I think most of them are good, but be sceptical over the lower percentage results - 5% Inuit, and similar. All the companies do the calculations based on their database, and the databases are all different, so the number of data entries relating to Inuits can be very small,so not reliable.
gt66 the reason that Ulster is so Protestant is because of the number of Scots who emigrated there after the Flight of the Earls in 1607. The government took the opportunity to confiscate six of the nine Ulster counties and grant the land to Protestant settlers, mainly from Scotland, thereby laying the foundation of today's divided island.
My paternal grandfather was from Northern ireland and with a good Scottish surname, however he was a catholic, not protestant. In the 1960s I worked with a protestant Ulsterman with a Scottish surname and he kept asking, if my grandfather was from Northern Ireland and had a Scottish name, why was he was a catholic. He just couldn't believe it was possible.