The expression "risk of faith" applies to only the world of human dealings; in the divine economy of things, faith is absolutely risk-free. It is perfectly safe to trust in Jesus.
"You will keep him in perfect peace, Whose mind is stayed on You, because he trusts in You." (Isaiah 26:3)
From "Between the Axle and the Rim", Basileia, 2010. Reprinted in Beyond the Shadows.
Faith is substance; it is never a vague idea in which some confidence is placed, as some modern dictionaries define“belief” to be. It is solid and divinely grounded truth that demands not a blind risk-involved, wager kind of response; but, absolute trust and surrender. In other words, faith is rational, faith is knowledge. When the Word is preached as it is, it allows no excuse; it needs no evidence, for it itself is the evidence; to deny it would be self-defeating. 
 “Faith is…the evidence of things not seen” (Heb.11:1).
Note (April 1, 2014)
* The idea of risk as applied to faith can only regard the test of faith. It doesn't become a blind leap as such; but, the test of a heart that is fully confident about God's purposes, a heart that truly and fully believes and walks by faith. It will need nothing else. "The just shall live by faith" (Rom.1:17)