Title: Neither this man nor his parents sinned
Knowing who sinned is the prerogative of God.
Since God is eternally holy, he can identify sin in the temporal realm, in the deepest recesses of our being, even in our intentions and in our thoughts.
The Lord Jesus cannot be the Savior unless he knows who have sinned and the consequences of transgression, as he came as the only solution to lawlessness that salvation might be manifested as the work of God throughout all the generations from Adam until sin and death be swallowed up in victory and time fades into eternity.