Faith is a human behavourial instinct that is the basis for the social construct of religion.
Religions require bodies that administrate them, which in turn create dogma that support their view of the world as they would like it. They demand that people have faith in the teaching, rather than question the teaching and become a heretic, or apostate.
So from this point of view religion is a method of social organisation that has little to do with saving peoples souls, and far more to do with command and control. Anyone who has met a bishop will see my point.
Faith is he human behaviour that is exploited by religion. Remember Wako?