We believe lying is wrong. We lie anyway. Actions lead to attitudes. Sin condemns us in future, and sucks away our spiritual vitality right now. An antidote for the corrupting effects of evil is repentant action.
Actions is a vital component of faith.
A. Faith cannot be reduced to key doctrines. Biblical faith is always dynamic. B. Faith cannot be produced by actions, but is definitely influenced by them. In OT, full knowledge of God comes through actively doing his will. But saved when he believed.