I think it is yourself who needs a more reliable teacher.
The  ouncil of Trent on the Sacrifice of the Mass.
"CANON III.--If any one saith, that the sacrifice of the mass is only a sacrifice of praise and of 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 Masss is not a "re-enactment" it is the re-presentation of Christ's sacrifice on Calvary.
The Council of Trent specifically taught this against the Protestant reformers who like you claimed the Mass was not a sacrifice but merely a memorial meal. If you disagree, show any teaching of the Church which contradicts the doctrine of the Sacrifice of the Mass.