Galatians 2:16 "… even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works..”   Faith is simply believing God and His Word. Faith is not works or behavior.  James 2:17  “Even so faith, if it hath not works, is dead, being alone.”    Faith will have works or corresponding behavior that expresses it.  The works are not faith, they are the result of faith.  So faith is believing and doing Gods Word!