Now faith is the assurance of things hoped for, the conviction of things not seen. Hebrews 11:1, ESV
Much of the false doctrine that we see in our time can be at least partially seen to emanate from a misunderstanding of what faith is. Paul tell us in Ephesians 2:8 that Christians are saved by grace through faith, and that not of ourselves, it is the gift of God. So, whatever faith is, saving faith has as its source something other than our fallen nature.