This is not a standalone game. To play, you need a copy of Coup.
With Coup: Reformation, each player must declare himself either Protestant or Catholic and can target only members of the other faith. Conversion is possible, however, for yourself or for another player by paying a charitable donation to the Almshouse. Like all factions, once you have eliminated the other sect, you just descend into in-fighting, so there's still only one winner and no second place.
Coup: Reformation adds a new fluid team dynamic to Coup as players jostle with their allegiance to take advantage or seek protection in the early stages of the game.