Faith without works is dead.
Can we really exhibit faith in Jesus Christ if we never do the things He prescribes?
We show faith by our repentance. We show faith through baptism. We show faith by obedience.
Imagine saying you have faith the lights will come on, but you never flip the light switch.
As for grace, grace is essentially filling in the void between what we do in our obedience, and where we fall short of the glory of God.
Grace is the result of the atonement of Jesus Christ.