The Left Hand of God — Paul Hoffman

Raised from early childhood in the Redeemer Sanctuary, the stronghold of a secretive sect of warrior monks, Thomas Cale has known only deprivation, punishment, and grueling training. When he escsapes to the outside world, Cale learns that his embittered heart is still capable of loving--and breaking.

But the Redeemers won't accept the defection of their prized pupil without a fight...