prayer, not a

not a prayer

Little or no chance or possibility (of succeeding, coming to pass, or achieving something). There's not a prayer of them getting into the playoffs this year. A: "Do you think there's any chance they'll convict the CEO?" B: "Not a prayer—he's too rich and powerful."
See also: not, prayer

prayer, not a

see under not a hope in hell.
See also: not