You completely misunderstand the Catholic position on the Mass. We agree wholeheartedly that Christ is the ultimate and final Priest and sacrifice. The Mass is not a new sacrifice but the making present here and now of the one sacrifice of our Lord on the cross. If you are going to disagree with Catholic teaching, please disagree with what we actually believe and not with a mischaracterization of Church teaching.
"If anyone saith, that the sacrifice of the mass is only a sacrifice of praise and thanksgiving; or, that it is a bare commemoration of the sacrifice consummated on the cross, but not a propitiatory sacrifice; or that it profits him only who receives; and that it ought not to be offered for the living and the dead for sins, pains, satisfactions, and other necessities: let him be anathema' (The Canons and Decrees of the Council of Trent, On the Sacrifice of the Mass, Canon III. Cited by Philip Schaff, The Creeds of Christendom (New York: Harper & Brothers, 1877), Volume II, p. 185)
There's another section in the Doctrine on the Sacrifice of the Mass that also states that the mass is indeed a propitiatory sacrifice, I can supply that as well.
It's at odds with Scripture. There's no need for further sacrifices. Jesus did it once, and he sat down at the right hand of God. Done.
Given the bold/italicized text above...
Are you saying that the mass is not a different sacrifice from that of Calvary, but the same sacrifice perpetuated through time?