I don't see any such "transformation" taking place. I mean this in two ways.
One, I see people changing themselves, through life circumstances, through influence from family or friends, and through deliberate self-reflection -- when the changes that happen to people's personalities can be consistently traced to tangible life experiences, I don't see a theological necessity to attribute those changes to a supernatural cause.
If that statement of yours were true I would be like you, an agnostic. Intellect alone is a trap and a dead end street. At some point (different for everybody) the presence of the Lord must sink 30cm lower, a life changing experience, without the risk of shipwreck will be lying in wait, as you eventually have experienced.
I give you credit for still calling yourself an agnostic and not (as so many) that move to the atheist position.
