That just... isn't true. At all. Ableism is a plague upon this earth and you should find yourself in a wheelchair someday to learn that you're not above us.
Language is fallible but God is above that. He speaks to each one of us individually, and in a way we each understand individually.
I'm a Child of God first and a human second.
And if you agree that God speaks to His children then you inherently also agree that there is a way to know what sin is, no?