For those of us who with the greatest respect, disagree with your Eucharistic theology, it is a sacrifice only in the sense that we offer our praise and thanksgiving.  Though unworthy,  we offer our selves, our souls and bodies so that He may dwell in us and we in him. 

Your church teaches, in concordance with Reformed theology that Calvary was once and perfect for God doesn't do things by halves. The propitiatory sacrifice has already been done perfectly. So to get around this conundrum, your church says, time is meaningless to God (true enough, but beside the theological point) and thus the RC Eucharist is an actual repetition of Calvary "re-presented".  It's a do-over by a priest with special "ontological" powers. But why the need? It's been done and perfectly so. Instead it is for some of us, a sacramental union of sign and heavenly grace with JC spiritually present in Bread/wine.

How many of your pew RC actually know they are required to believe this and do is another question.