Odd since much of Protestantism is based on IGNORING the Discourse on the Bread of Life.
Certainly, as born again Christians, we are very much at home in John 6. We understand the metaphor, not the extreme wooden literal meaing.
John 6:40For my Father's will is that everyone who looks to the Son and believes in him shall have eternal life, and I will raise him up at the last day."
63The Spirit gives life; the flesh counts for nothing. The words I have spoken to you are spirit. and they are life.
I apologize, I can never seem to remember that "sola scriptura" is supplanted by metaphor when Catholics read it a certain way.
I do need to ask though, what about the many millions of Protestants whose belief in the Real Presence is nearly indistinguishable from Catholic beliefs? Are they not "born again" enough for you?
As far as the other butchered verses from John 6, of course flesh alone is nothing, it must have the Spirit, that's why He said it is Spirit AND Life.
[27] Therefore whosoever shall eat this bread, or drink the chalice of the Lord unworthily, shall be guilty of the body and of the blood of the Lord. [28] But let a man prove himself: and so let him eat of that bread, and drink of the chalice. [29] For he that eateth and drinketh unworthily, eateth and drinketh judgment to himself, not discerning the body of the Lord.
-- 1 Corinthians 11:27-29
Perhaps you would like to explain how a person can unworthily participate in a "metaphor"? How can a person be guilty of the Body and Blood of the Lord for not discerning a "metaphor"?