According to the dictionary, "faith" has a lot of meanings:
1. confidence or trust in a person or thing: faith in another's ability.
2. belief that is not based on proof: He had faith that the hypothesis would be substantiated by fact.
3. belief in God or in the doctrines or teachings of religion: the firm faith of the Pilgrims.
4. belief in anything, as a code of ethics, standards of merit, etc.: to be of the same faith with someone concerning honesty.
5. a system of religious belief: the Christian faith; the Jewish faith.
6. the obligation of loyalty or fidelity to a person, promise, engagement, etc.: Failure to appear would be breaking faith.
7. the observance of this obligation; fidelity to one's promise, oath, allegiance, etc.: He was the only one who proved his faith during our recent troubles.
8. Christian Theology. the trust in God and in His promises as made through Christ and the Scriptures by which humans are justified or saved.
—Idiom9. in faith, in truth; indeed: In faith, he is a fine lad.
The word "faithful" also has its share of meanings:
1. strict or thorough in the performance of duty: a faithful worker.
2. true to one's word, promises, vows, etc.
3. steady in allegiance or affection; loyal; constant: faithful friends.
4. reliable, trusted, or believed.
5. adhering or true to fact, a standard, or an original; accurate: a faithful account; a faithful copy.
6. Obsolete. full of faith; believing.
–noun 7. the faithful, a. the believers, esp. members of a Christian church or adherents of Islam.
b. the body of loyal members of any party or group.
It has been a major jump in my thinking but I had a friend point out to me once that the real story of "faith" is not our faith in God but rather His never-ending faithfulness to us. No matter what we do, no matter where we go, no matter how much we try to shut Him out, God remains faithful to us.
I agree with my friend -- that is indeed the real story of faith.