Luck is a very familiar word to all and used in many forms. We wish someone “good luck” as much as say “hello.” We hear the phrase, we use the phrase and “Good luck” becomes a conditioned response.
Faith, too, is a familiar word. it is used by many to express a belief in someone, “I have faith in you” or “Have a little faith” are two examples of its use. We express a faith in God. We can express a faith in each other.
Luck is crossing your fingers.
Faith is expecting.
It sounds lame when a Christian wishes someone “Good luck!”
“I have faith in you” would be better.