First, there is a bit of a confusion here. The Real Presence in the Eucharist is resurrected Christ, not incarnate Christ. That is the Christ entering the upper room.
However, your apparent insistence that incarnate Christ be denied His divine nature, which includes omnipresence, is, I believe, Arianism, if I can keep my heretics straight. Is walking on water denial of the reality of the incarnation?
"resurrected Christ, not incarnate Christ"
Are they not one in the same???
"our apparent insistence that incarnate Christ be denied His divine nature, which includes omnipresence"
Paul clearly teaches that Christ "emptied himself" in some way, to become a man...
"Christ Jesus, who, though he was in the form of God, did not count equality with God a thing to be grasped, but made himself nothing, taking the form of a servant, being born in the likeness of men. And being found in human form, he humbled himself by becoming obedient to the point of death, even death on a cross."
When Christ became a man something changed - changed forever. Christ now has a human body - with nail peirced hands - something which he did not posess in eternity past. Does you theology not recognize that fact?
"I believe, Arianism, if I can keep my heretics straight."
Nope - that's not me. "The doctrines of Arius, denying that Jesus was of the same substance as God and holding instead that he was only the highest of created beings, viewed as heretical by most Christian churches."
"Is walking on water denial of the reality of the incarnation?"
Absolutely not.