Dear Pastor I Talked to for Free Pizza,
When I tell you that I doubt that your healing prayer will fix the malformation in my neck, and point out that others have tried to pray for healing for that very problem, with no success, you should probably not respond with: “That doesn’t matter, because it’s all a numbers game!”
Sure, it’s true! Your con is just a numbers game. Pray for enough people, and some fraction of the potential marks will have coincidental improvements or perceived improvements in various ailments that are self-limiting or have variable courses. Then some fraction of that group will commit the post hoc, ergo propter hoc fallacy, falsely attributing the improvement to the spell you cast. Some will even start giving your outfit money.
You just might want to avoid giving the game away like that, as I don’t think “it’ s a numbers game” is exactly concordant with the all-powerful, all-knowing healer god myth you’re peddling.
Just friendly advice from your cheerful campus atheist.