God is good and holy.
I am not good or holy.
I am a sinner.
Jesus became sin.
Through his death and resurrection, God declares me as righteous.

. . .

I am not righteous, but God declares me as righteous.

Jesus was not sinful but became sin.

Jesus became what I am, so that I may be declared what I am not.

. . . If that’s not love, I don’t know what is.