The problem is not so much being blind, as in
the imagination that one isn't blind when one is. Jesus told the Pharisees...because you say "we see"
your sin remains.
Righteousness is granted to a person if they can admit their own blindness. From there they can receive light.
The devil's tactic is to create a
shadow religion whereby God can only see you AS IF you were actually in the light...even as you wallow in darkness. This tries to push the blindness back onto God. As in..."when God sees me He only sees JESUS."
....or else...the fiction I believe in is part of God's plan...the upside down gospel...making something to believe in about oneself from nothing. In that scheme all I have to do is believe that in my nakedness I am actually fully clothed, that in my blindness I can actually see. The foolish idea is that God routinely called things into existence that aren't there. That fictitious proposition is proposed by the devil as a faith that saves. Utter foolishness! It is turning aside to fables. The fable in this case is the "emperor's new clothes" (of righteousness) So then unrighteousness is seen as righteousness...destroying the gospel by twisting its message to favour the flesh and its pretense of naming and claiming. In this scheme God's love blinds Him to the truth.
If that was the case then why does Jesus rebuke the Laodiceans so sharply, calling them poor naked wretched and blind? The devil takes away people's reasoning power...giving them "hopium" ...by promising them life and glory for a mere posturing that doesn't include God at all. No, it is a scheme based on the imagination that exalts itself above a real knowledge of God.