Of all the beliefs you hold, the most dangerous...

[xoxoxoBruce]

You're limiting the meaning of "faith". By projecting your meaning of the word, you misinterpret what others are saying, when they use the #1 meaning.

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.
—Idiom
9. in faith, in truth; indeed: In faith, he is a fine lad.