When it is the Body, Blood, Soul and Divinity of Our Lord and Savior (not just a "communion wafer" in substance anymore) and is received in a state of grace, it is. Yes. It is the Bread of Life and "he who eats of it shall live forever."
If you don't believe that, then you speak for you. When Christ the Lord speaks that and I believe Him, I believe because He told me.
As Mad Dawg, says (only in many fewer words herewith), your "take" doesn't shake mine.
In any event, Jesus is the only Savior. We're talking about HOW, not whether.
So then all of those who eat the communion wafer in Lutheran, Episcopalian, Methodist, all churches and denominations, not just Catholic churches, "shall live forever"?