Vampire Vow by Michael Schiefelbein

"For centuries Victor Decimus, former Roman officer under Pontius Pilate, has fed his rage against the God of the Christians with blood. Desperately in love with but ultimately rejected by the young Jesus, Victor turns on the citizens of Jerusalem in a frenzy of rape and violence, leaving him no escape but through entry into the chaotic world of darkness he finds as a vampire. Two thousand years later, Victor, in the guise of a monk, takes up residence in the Monastery of St. Thomas, nestled in the Appalachian Mountains. In Brother Michael he finds a hint of the love he has been seeking, but his rage, his desires and his vow of vengeance against the God of the christians drive him to sadistically insane levels of violence against his prey, leading to an investigation of the monastery. With discovery imminent, Victor launches his most daring effort: the transformation of Brother Michael. And with everything at stake, the consequences of interference are horrifying beyond mortal imagination." (From Amazon.com)

Paperback Info: ISBN 1555835864, Alyson Pub, 2001