by A. G. Baines
Just as humanity was about to start colonizing other worlds, an asteroid struck Earth. The survivors call it Wormwood, a punishment sent by God for the sins of mankind, especially the mass abandonment of religion in favor of science.
Jude is a priest in the new Theocracy. But when his brother, whom he thought dead, turns out to be alive but scheduled to be executed, Jude's faith is tested.