That is true what objectively conforms to reality; objective understanding is life's faith-quest (fides quaerens intellectum).
No matter how fervently we believe, if what we believe has no evidence of corresponding with reality (and/or does not conform with reality), we may well be deceived in our belief; of course, subjective truth, informed by trustful communication, is that which we believe to be true on evidence as we understand it. A lot of misinformation has been transmitted within various religions, including Roman Catholicism - the faith of my belonging.