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Is the spiritual union another union? A union in addition to our carnal union with Christ? Or is it a sharing in the one and only union between God and man brought out in Jesus Christ?

This is a very important question, for if the spiritual union is an additional union, then our salvation depends not only on the finished work of Christ but upon something else as well, which has later to be added on to it before it is real for us.

That was, in fact, the idea taught by Roman Catholics, for example, in their doctrine of baptismal regeneration and ex opere operato sacramental incorporation into Christ. But it is the same idea that is taught also by Protestants in their doctrine of a union with Christ which is effected by faith or by conve ...