It's probably more demystification than dismissal.
There are aspects of race that I think are constructed socially (mores), others (DNA) not.
Sin, however, completely is because I have no idea how it can be said that God prescribed what sin is. If a group of human beings invented a religion that has rules, then it is a societal construct. There's really nothing else that it can be.
DNA doesn't really naturally divide people into races though. Especially not into the way that race has been socially constructed (most human diversity is in Africa, etc.)
