Jesus said is, that's fairly simple enough, but he also said unless you do eat my body and drink my blood, you will have no part of me. That is some serious words there that I'm not willing to risk. So He said is and unless you do. That's all it takes for me.
Yeah, I understand the differences between the dominant Protestant, Lutheran and Roman catholic views of the Eucharist/Lords Supper.
It woulds make a good thread on its own?