Faith is another word for belief, the noun form of the verb to believe, to have faith is to believe in someone or something, to trust in or rely on someone or something. There is no intrinsic value in faith itself.
Faith can be good or bad, wise or stupid.
It all depends on the faithfulness of the one in whom you have faith, the trustworthiness of the one in whom you trust. The value of Biblical faith is rooted in the trustworthiness and faithfulness of God the Father and his Son Jesus Christ. Trust without knowledge is not true faith. People talk about accepting things on faith, and having blind faith, and people often contrast faith and reason, so that one would think that they are mutually exclusive, but Biblical faith is not blind, it is not intellectual suicide, it is not an abandoning of reason, it is a faith based on facts and reasonable assumptions. Faith therefore is not compatible with ignorance.