The faith of God is different in substance and in authority from worldly pseudo-faith.

FREE on-line BOOK (a classic): The Real Faith, by Charles S. Price

FREE on-line BOOK (a classic): The Meaning Of Faith, by Charles S. Price

Romans 14:23 tells us simply that anything that is not of faith is sin. Faith comes from God. (James 1:17) Faith comes by hearing the word (Greek: rhema = utterance) of God. (Romans 10:17) It is possible to read the Bible and not hear the word of God. (2 Corinthians 3:14)

• Worldly pseudo-faith is merely presumption or self-confidence. Sometimes, we, as Christians, try to approach God with this kind of make-believe faith. We try to work up faith in our minds. But this is the same kind of faith by which the Atheist believes in such things as biblical error, Naturalism, Materialism, or Evolutionism. It is presumption, not real faith.
• The faith of God is a gift from God.
  • As with all spiritual gifts, it flows from the Father.
  • Real Faith is a substance. Specifically, it is the substance of things hoped for.
  • Real Faith is evidence. In fact, it is the very evidence of the things not seen. It comes by hearing, but not by hearing just anything. You must hear a word (literally, utterance) from God.
  • Real Faith comes when God speaks and leads and we acknowledge Him--then He directs our path. (some caveats about hearing God's Voice)
  • Whatever is not of faith is sin.
  • Real Faith gives us access into God's grace, and God's grace then does God's works through us.

Read more about what "by grace through faith" actually means.