
Scholastic Theological Arguments give me a nervous tick.
They are sometimes necessary, just like cleaning a clogged toilet.
But, prolonged practice of both is dangerous for precisely the same reason.
Pursuing Theology, Ethics, and Spirituality that are Christlike: Christocentric, Healing, Reconciling, Incarnational, Sacramental, Trinitarian, Liberating, Inspired, Katholic, and Embracing. And other random stuff.

The short answer is that we believe that Christ is really present in the sacrament of Communion. To understand this, we must remember what a "sacrament" is. The prayer book defines it as "an outward and visible sign of an inward and spiritual grace" (BCP 1979 pp. 357-361). In short, it is a physical thing, like bread, wine, water, oil, that God uses to share the presence and power of Jesus Christ, through the working of His Spirit.