From Binding of Isaac: Rebirth Wiki
Rosary Bead is a trinket.
- Increases the chance to see an Angel Room. The Angel Room chance rises from 50% (base chance) to 75%.
- Increases the chance to find The Bible in the Library and Shop.
- If a Devil Deal or Black Market deal has been paid, an Angel Room will not spawn, even with Rosary Bead.
- This item does not increase the chance for an Angel/Devil Room Door to spawn when a Boss is killed, unlike Goat Head or The Book Of Belial.
- Despite indicating "Faith Up", there is no "Faith" stat in the game. "Faith Up" only serves to inform the player that it is linked to Angel Rooms in an unspecified way.
- The chance to find The Bible in the Library is increased to 45% and the chance to find it in the Shop is increased to 13%.[1]
The Binding of Isaac: Rebirth 
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