Just go by what the Bible itself defines 'faith' as being. That's what I do.
"1Now faith is the substance of things hoped for, the evidence of things not seen. " Hebrews 11:1 KJV
Faith is the
knowledge that something you can't see is true. That 'alone' never saved anybody, and never will. You have to
trust in what faith shows you to be true in order to be saved. The confusion comes in because we call that 'having faith'.