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
Farlex Dictionary of Idioms.

prayer, not a

see under not a hope in hell.
See also: not
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • not a prayer
  • not a dog's chance
  • not a cat in hell's chance
  • on the (off) chance
  • on the chance
  • one chance in a million
  • sporting chance
  • sporting chance, a
  • a sporting chance
  • a chance in a million