At Rank 1, your Faith growth will increase by 8% per Rank.
At Rank 2, your Faith is increased by 1.
At Rank 3, when using Enchantment to apply a 'Blessed' or 'Exorcist' property, your Skill is increased by 2.
At Rank 4, your Faith is increased by 1.
At Rank 5, your belief is so strong that it may cause divine interference, giving you a small chance that any damage you take will be reduced by your Faith.