Trust
The verb form of "faith" really means "trust."
When we understand this, then we can consider the grammatical variant "faith of Jesus" (versus "faith in Jesus") in Romans 3:22, 25, 26; Galatians 2:16,20; 3:22; Ephesians 3:12; Philippians 3:9. We can consider that Jesus' statement on the cross "into your hands I commit my Spirit" near the time He said "why have you forsaken me?" demonstrates His trust (the "faith of Jesus") which is the kind of "faith" that "saves" us.
If you are yawning and wondering why I would care about this . . . . here are the implications of this realization:
turns kingdom reality from future to present;
turns life from religion to relationship;
turns focus from me to God;
turns issues from head to heart.
And when I try to get God to give me guidance on the "big decisions" of life, He always seems to shrug in indifference and lead me back to this.