[Titus Quinctius Cincinnatus]

so when Paul says in 1 Cor 10:16, “and is not the bread we break a participation in the Body of Christ”, Catholics believe him. what do you do?

Oh, I believe him too, since he said the cup and bread are had in communion, the correct meaning of the Greek koinonia, at least as is indicated by every other use of that word in the NT.

[one Lord one faith one baptism]

well, well, you accept the Real Presence and reject the Gnostic symbolic belief? welcome to historic, orthodox Christianity!