David Koyzis: Baptist and Calvinist? Why not Lutheran?

Ever sharp David Koyzis:

As a Reformed Christian who is in some fashion heir to Calvin’s legacy, I find myself puzzled when I see a title such as this: “Calvinism in the Southern Baptist Convention.” What does it mean to be a Calvinist in a Baptist denomination? It cannot imply an acceptance of Calvin’s view of the sacraments, which take up considerable space in his Institutes of the Christian Religion and are more than incidental to his theology as a whole. It does not seem to imply recognition of a real spiritual presence of Christ in the Lord’s Supper, or of baptism as a sign and seal of God’s grace. Nor does it seem to imply an acceptance of Calvin’s ecclesiology, which takes up volume IV of the Institutes and is generally followed by those churches calling themselves Presbyterian or Reformed….

On the other hand, when Reformed Christians established their churches in the New World, they usually brought their polity with them to this side of the Atlantic. Thus if Lutheranism has been historically more flexible than Calvinism with respect to ecclesiology, it is not immediately evident to some of us why becoming a Calvinist is usually thought to be a soteriological statement while becoming a Lutheran is an ecclesiastical one. But it may be that I’m missing something that others have picked up on.