David Post and many other critics of the Court’s Hobby Lobby decision believe it is absurd to imagine that people can exercise their religion through a publicly traded corporation. But, at least in some instances, this is entirely possible, in much the same way as people can use such firms to engage in speech or adhere to secular moral values.
Of course the law usually respects the corporate form. The law ought to do so whenever it’s convenient to do so, and ignore the corporate form whenever that’s convenient. And regular people like you and me should always look through the corporate form and see the people.