I think that it's a matter of faith.

Faith need not be blind, unreasonable or illogical.  Certainly in some cases, those adjectives apply, but it would be just as blind, unreasonable and illogical to suggest that it is necessarily so.   What the author describes as mainstream liberal churches do not encourage faith; by emphasizing a metaphorical interpretation, they are effectively removing God from the church.  Faith requires a choice - a choice to believe that there is more to the world than can be strictly proven.  A church that teaches that the ancient prophets were telling the truth - that they had the truth revealed to them - will support faith more than the idea that these were merely wise people.

A world that loses faith will be poorer for it.