User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5839833-20121211134848/@comment-3146930-20121224182221

Well if the priest was stealing money from the church, odds are he didn't believe in God or any gods at all, meaning he didn't believe in an afterlife. When he died, he was sent to the closest realm of the afterlife, which in this case would be Hades (right under America). Or he saw the Greek Underworld as the closest thing to match his understanding of the Underworld and was sent there as a result.