Stories about Druids
All of the references about druids can be traced back to the writings of one individual, Julius Caesar. He may well have been prejudiced against the Celts because of their continual warfare with the Romans. In war, the enemy is routinely demonized. Some remains of executions have been found in the archeological record, but it is not obvious whether the victims were killed during religious rituals or to carry out the sentence of a court. There is one reference to human sacrifice in Celtic literature, but it appears to be a Christian forgery. The ancient Celts might have engaged in ritual killing; certainly other contemporary societies did. Modern Druids, of course, do not.
Writings on Celtic Sacrifices
The whole nation of the Gauls is greatly devoted to ritual observances, and for that reason those who are smitten with the more grievous maladies and who are engaged in the perils of battle either sacrifice human victims or vow so to do, employing the druids as ministers for such sacrifices. They believe, in effect, that, unless for a man's life a man's life be paid, the majesty of the immortal gods may not be appeased; and in public, as in private life they observe an ordinance of sacrifices of the same kind. Others use figures of immense size whose limbs, woven out of twigs, they fill with living men and set on fire, and the men perish in a sheet of flame. They believe that the execution of those who have been caught in the act of theft or robbery or some crime is more pleasing to the immortal gods; but when the supply of such fails they resort to the execution even of the innocent.