You're probably right...for the consistent. However there are theistic evolutionists who see evolution as the method God used to create the world--and since Adam and Eve, the corruption of sin has come, contradicting evolution, at least in the moral sphere.
I believe it is very difficult to be any kind of consistently orthodox Christian without a belief in Adam and Eve. Without a literal "old Adam" who fell the "new Adam" of Jesus Christ who redeems makes little sense--and religion becomes, as it appears to be for Schori, do-goodism with costumes and ceremonies.