Here's a little test.
See if you can find faith in the unsaved human heart.
“But if ye be led of the Spirit, ye are not under the law. Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.” Galatians 5:18–21 (KJV 1900)
Now, having searched in vain, see if you can spot faith in the saved person.
“But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, Meekness, temperance: against such there is no law.” Galatians 5:22–23 (KJV 1900)
Now, is faith a work of the flesh? Or is it a fruit of the Holy Spirit?