DHK, how big is your God? Cannot the God of universe offer Himself to us in any form He wants? He chooses bread and wine. He indwells me with His Holy Spirit.
It is not a matter of how big God is.
For example, God is not so big that He will lie or go against His nature.
The same is true here. God will not advocate heresy.
You have God as an idol. But that is not the God I serve. Listen first to the description by Paul about God:
Acts 17:19 And they took him, and brought him unto Areopagus, saying,
May we know what this new doctrine, whereof thou speakest, is?
Acts 17:24-25 God that made the world and all things therein, seeing that he is Lord of heaven and earth,
dwelleth not in temples made with hands;
--Understand this truth!! God does not dwell in temples (or in any other thing) that is made with hands. That includes the host of bread and the wine or juice that is made by the RCC, the Orthodox or any other man. God dwells in heaven.
John 4:24 God is a Spirit: and they that worship him must worship him in spirit and in truth.
--He does not dwell in the elements of the Lord's Table.
25 Neither is worshipped with men's hands, as though he needed any thing, seeing he giveth to all life, and breath, and all things;
--He is not worshiped with men's hands.
He does not need anything.
It is God that gives life and breath to all things.
There is no life and breath in the communion host. It is a piece of lifeless bread. Christ is not in it. It is just a piece of bread and that is all. It is symbolic. Christ is not there. Listen to what the Word says.
Isaiah 40:18 To whom then will ye liken God? or what likeness will ye compare unto him?
Isaiah 40:21 Have ye not known? have ye not heard? hath it not been told you from the beginning? have ye not understood from the foundations of the earth?
Isaiah 41:28-29 For I beheld, and there was no man; even among them, and there was no counsellor, that, when I asked of them, could answer a word.
20 Behold, they are all vanity; their works are nothing: their molten images are wind and confusion.
Even Isaiah knew of the RCC, it seems.
Vanity, nothing, and confusion.