they exist only on paper
There's been some good little discussion about the article at Jesus Radicals. Here's one of my responses that I think adds to the article:
It sounds like you believe that "legal entities" have actual existence, that they're real things. People have real existence, their labor and the things they produce are real, buildings are real, but "legal entities" exist only on paper, and in the minds of those people who create them and enforce them and obey them.
The OWS protesters (and the movie makers) are right to object to a corporation being seen as a "person." Because that is a lie. Persons are created by God and honored by God; a "legal entity" is a creation in the minds of human beings only, and is infinitely less than a real person. A corporation has no soul to save.
I'm glad you mention Walter Wink's work; I almost included his theories in the article. I agree he has been quite influential in convincing people that corporations and other institutions are spiritual realities, "powers," with a real existence distinct from the people that make them up. But this also is false. Corporations are quite clearly created by human beings, and human beings cannot create real, living spiritual entities (only "legal entities"). Wink's institutional "powers" are certainly believed in by people, and treated as real, but only in the same way that people have always created false gods, idols that have no actual existence (except as a piece of wood or stone).
I think Wink's critiques in the Powers series are very good. But his theology of corporate entities (that can be redeemed) perpetuates and legitimizes the lie that corporations and states would have you believe, that they are real things, mighty entities, even spiritual entities. What Wink's theology does is keep us from completely rejecting the false and corrupting power of our human institutions and keep us committed to them, trying to "redeem" them. How convenient for the institutions. I'm not at all surprised that message was so well received and popular in our society.
There is real power in corporations and other human institutions, but it is just the power of organized human beings working together. A limited power, easily twisted and very tempting. The power of Babel. The power of "We, the People." But Jesus shows us that we can avoid the temptation of that power and instead wield the unlimited, incorruptible power of God.