There is nothing contradictory in disposing of the bread and wine after Communion, because although Catholics regard the Presence of Christ in the Eucharist as a permanent and **substantial **presence, Lutherans seem not to. Christ Himself says nothing on the matter.
That Presence can be real, without being substantial or permanent. What it can’t be, is substantial but not real. It can perfectly well be
real and
permanent. Insisting on the “Real Presence”, is not a uniquely Catholic position, but one common to several theologies. What distinguishes the RC understanding of the Eucharistic Presence, is that He is Present in the manner of a substance, and that His Presence is in that sensea substantial Presence.
What is not implied, at all, is cannibalism, because the Eucharist is a sacrament - not despite its being this. There is no collision between what the Eucharist is (does ?) - that is, a sacrament, sacrifice, and eschatological meal - and the reality, or “non-fictitiousness”, of the Presence of Christ.
Other understandings of Presence of Christ in the Eucharist are possible, such as receptionism; but this is not a thread about the variety of actual Eucharist theologies as such.
There is nothing out of place in calling the Eucharist a symbol - it is one. What is not possible, is for Catholics to say it is “nothing but” a symbol. It is a symbol - it is also many other things. The mistake is to insist that it is only one out of the many things that it is.
Protestants are not disregarding the words of Christ any more than RCs are - it is not self-evident from the Bible that the Eucharist gives us a Presence of Christ which is
- substantial
- permanent until it ceases as a result of the destruction of the object which embodies it
- embodied in a tangible object which may be touched, moved, and the like
- a sacrifice to be offered even today
In short, although the RC understanding of the Eucharist may well be in accord with the Biblical data, this is not the same as saying that the Biblical
data demand to be understood as the CC understands them; nor that the RC understanding is the only correct one or only possible one. It may be both the only correct one; but quoting the Bible won’t show this to be so beyond doubt. It shows only that the Bible can be quoted to support the Catholic understanding of the Eucharist; but not that the Catholic understanding is an adequate understanding of the Biblical data; for they could be combined in many different ways, to give an understanding of the Eucharist which uses all the texts relied on by Catholics, but combines them in a different combination. ##