From the back cover:
It ain't easy being one of the chosen in the Weird West. In the towns, evil folks of all stripes wander about the place, looking for good folks to lead astray. It's even worse in the wilderness, where creatures straight from the pits of Hell lurk, ready to rip off your good right arm faster than you can spit back a "Hallelujah!"
It's time for the forces of good to strike back.
Fire & Brimstone puts the wrath of God back into righteous fury. It's got rules for how to play blessed folks from many major faiths, from Bible-thumping Christians to enigmatic Buddhists. There are also more than 60 miracles for the faithful, plus two dozen all-new gifts and 20 different forms of divine intervention. It's all capped off by an adventure sure to send shivers down even the most pious spine.
After the Good Book itself, it's the next best thing." (from back of book)