Sure, the biblical definition, which we have given you
I do not remember seeing in the Bible the words "What is faith? It is made up of three things—knowledge, belief, and trust. "
I agree as a common-sense definition, that those are a pretty good description: but I don't remember biblical backing for it.
What I was intending to convey with the question was one definition I heard (from a Lutheran pastor) that grace is "God's unmerited favor."
And the idea there, that if it is unmerited, then we cannot "deserve" it by our faith.
(Opening up several more doctrinal cans of worms, which I was trying to avoid -- it is for that reason I wanted to get common definitions before continuing.)
In the meantime, I recommend a dose of Romans 14, that we should pray for one another.
"It is before his own Master that he stands or falls...God is able to make him stand."
Cheers!