This is very interesting. Do you know of any programs or documentaries about these Celtic sacrifices? I have been following a number of different historical programs on the ancient religions in South America, compared to Egypt and other lands were there seems to be similarities. Makes you wonder if there was more communication between the different societies then we have been led to believe.
Yes, there is enough evidence that we can say that the ancient Celts did practice and perform some form of human sacrifice. There is a great deal of evidence that these sacrifices were voluntary in nature and that the sacrificed were intermediaries that took the petitions of their people directly before the Gods of their clan.