Roman catholicism teaches the "mass" is a re-sacrifice of Christ over and over again whereby the priest calls Christ down from Heaven and Christ obeys.
Christianity recognizes the Lord's Supper or Communion is a remembrance of His one time sacrifice on the cross for our sins. Hence, "do this in remembrance of Me".
AMEN TIO THIS!!!
That statement is categorically false and slanderous.
The Mass is not a "re-sacrifice," nor is it a "new sacrifice," nor does it sacrifice Christ "over and over again". It is a participation in the one single sacrifice of Calvary and makes that sacrifice, which is eternal because it is present in the heavenly Holy of Holies (read Hebrews) present to us in our time.