Once “acts of unbelief” fills the slot of actuality, then it becomes clear that the human faculties “of nature” are flawed. The intellect and will have been so occluded by the Fall that they cannot see through the fog. (Translation: Those bishops selling indulgences in order to build a fancier Renaissance Style Cathedral than the other dioceses did not have the smarts or the love-of-Christ to see through their own charade: See “Tower of Babel” above).
Once “acts of unbelief” fills the slot of actuality, it also becomes clear that whatever puts these acts into context has to be powerful and capable of acting as a crutch for a mechanically flawed intellect and will. Otherwise, we are fated to follow our acts of unbelief to our own destruction.
What was required of God to save humanity?
Today we call it: “Being born again.”
With Martin Luther, the Sacrament of Baptism took on a whole new role.