Life after death is not quite a complete history of the afterlife in Western religion. Alan Segal follows the development of beliefs in the afterlife in Christianity down to Augustine and in Judaism through the rabbinic period. Only in the case of Islam does he comment briefly on contemporary beliefs.
The adjective Celtic has been used to sell so many things—from books and music to jewelry to alternative spiritualities—that a canny reader might be forgiven for passing over a book called The Last of the Celts as one more piece of fluff.
It is highly unlikely that the late Paul Holmer ever would have read a book about youth ministry. Holmer, who taught philosophical theology at the University of Minnesota and Yale Divinity School, was not particularly interested in practical ministry studies on their own terms.