PugetSoundSoldier:
Technically, we are saved by God’s Grace, through Faith in God. However, how is Faith defined is what differentiates Catholic, and Eastern Orthodox Theology, from the “Various” theologies of the Protestant confessions.
Faith in Catholic Doctrine is defined as both a gift of God and a human act by which the believer gives personal adherence to God ,who invites is response, and freely assents the whole truth that God has revealed. It is this revelation of God which the Church proposes for our belief, and which we profess in the Creed, celebrate in the sacraments and live by right conduct that fullfills the twofold commandment of charity (as specified in the ten commandments), and respond to in our prayer of Faith. Faith is both a theological virtue given by God as grace, and an obligation which flows from the first commandment.
I think that fully fits what Protestants believe, too. Faith is what God gives us and what we place in Him; it can be expressed by actions, but it is not an action and not dependent upon specific actions.