Hadn't a prayer

Hadn't a prayer
 

What does this means?

The phrase is: "and I hadn't a prayer of building a canoe"

It means: I didn't have a chance.
Example: He thinks he can build a canoe. He doesn't have a prayer
Cree que puede construir una canoa. El pobre no tiene ni lo mas mínimo posibilidad de tener éxito.

Poli the word prayer does not mean Oracion, or Rezar?

Yes, the word prayer translates to oración or rezo. (to pray = orar/rezar)

But, in the idiomatic expression (to not have a prayer), it means no tener remedio.

Crotalito así es el modo de hacer esta pregunta: Does the word prayer
mean oracion or rezar?
Si Crotalito, prayer significa oracion.
to pray=rezar, suplicar

In addition to what Rusty says, to not have a prayer can also mean no tener ninguna posibilidad (de ganar/triunfar/sobrevivir/logar algo etc).

Muchas gracias a todos. Me imaginaba que podía ser eso, pero quería estar seguro.