DBT
Contributor
faith
fāTH/
noun
noun: faith
1.
complete trust or confidence in someone or something.
"this restores one's faith in politicians"
synonyms: trust, belief, confidence, conviction; More
optimism, hopefulness, hope
"he justified his boss's faith in him"
antonyms: mistrust
2.
strong belief in God or in the doctrines of a religion, based on spiritual apprehension rather than proof.
synonyms: religion, church, sect, denomination, (religious) persuasion, (religious) belief, ideology, creed, teaching, doctrine
"she gave her life for her faith"
a system of religious belief.
plural noun: faiths
"the Christian faith"
a strongly held belief or theory.
"the faith that life will expand until it fills the universe"
Origin
Yes, there are two uses for the word "faith", The first is the secular use and generally requires some evidence to generate the faith. The second is the religious use and typically means beleif without empirical evidence.
Your use of the word "faith" always involves the religious use of the word.
At least that's how things roll in the English language.
Yes. To have 'faith' has a specific meaning that does not relate to something you can readily verify.
Also loose terminology; 'in good faith' is probably better described as something done with 'good intentions' or an act of 'good will' - which is nothing to to with a conviction of truth in regard to things that can't be verified. Or someone says 'I have faith that this will happen' instead of 'I hope this happens'' Hope being conflated with faith, faith with trust or confidence.