Data updated
Money Prayer I needs 7 parishioners and has a difficulty of 15. Seven in the pews gives a 46% chance, and 15 makes it certain. Grade III asks for 50 and a difficulty of 70. Other sermons exist in the code but can't be obtained, which leaves 27 grades in 11 families.
Parishioners are the lower of your Likes and your church's quality. You need the prayer's minimum to start, and the sermon spends that many Likes.
Success chance is parishioners × 100 divided by difficulty, capped at 100%. Parishioners equal to the difficulty guarantee it. A win adds bonus faith and coins plus the prayer's blessing.
On success most prayers add coins per point of graveyard quality. Pair a well-kept graveyard with Money Prayer and the payout climbs with every headstone you upgrade.
The Priest and Cardinal talents, and their second tiers, raise the per-parishioner rates. The dislike debuff lowers them. Perk badges on each prayer show the numbers with them applied.
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Full success: the payout with exactly as many parishioners as the difficulty, before the graveyard and church quality bonuses, with no talents. Coins are bronze, 100 to a silver.