Is Christ's death effective

Is Christ's death effective? Let us look at the RCC mass from the perspective of Hebrews chapters 9 and 10.

The RCC declares that the mass is limited in its effectiveness, as a propitiatory sacrifice. The RCC teaches that Catholics can go to mass every day of their lives and will die impure and be required to spend time in Purgatory before entering the presence of God.

However, in Hebrews chapters 9 and 10 we learn the Christ is superior to all that has come before, and that the New Covenant is far superior over the Old Covenant with its perpetual animal sacrifice. Christ entered into the Holy Place once for all, by His own blood 'having obtained eternal redemption Hebrews 9:12. Christ is able to cleanse the consciences of those for whom it is made Hebrews 9:14.

24 For Christ has entered, not into holy places hmade with hands, which are copies of the true things, but into heaven itself, now to appear in the presence of God on our behalf. 25 Nor was it to offer himself repeatedly, as the high priest enters the holy places every year with blood not his own, 26 for then he would have had to suffer repeatedly since the foundation of the world. But as it is, lhe has appeared monce for all nat the end of the ages to put away sin by the sacrifice of himself. 27 And just as it is appointed for man to die once, and after that comes judgment, 28 so Christ, having been offered once qto bear the sins of many, will appear a second time, not to deal with sin but to save those who are eagerly waiting for him. Hebrews 9:24-28

Christ did not need to 'suffer often'. His one act of suffering was sufficient for all time. So there is no need to offer Himself repeatedly, as did the High Priest with the on-going need for animal sacrifice. The old sacrifices could not put away sin and had to be repeated. Catholic theology demands that this 'unbloody sacrifice' in which they continually engage in the RCC mass, demonstrates the RCC belief that Jesus' once for all time sacrifice was insufficient to save and atone for all mankind.

Hebrews 10 New International Version (NIV)

Christ’s Sacrifice Once for All
10 The law is only a shadow of the good things that are coming—not the realities themselves. For this reason it can never, by the same sacrifices repeated endlessly year after year, make perfect those who draw near to worship. 2 Otherwise, would they not have stopped being offered? For the worshipers would have been cleansed once for all, and would no longer have felt guilty for their sins. 3 But those sacrifices are an annual reminder of sins. 4 It is impossible for the blood of bulls and goats to take away sins.

5 Therefore, when Christ came into the world, he said:

“Sacrifice and offering you did not desire,
but a body you prepared for me;
6 with burnt offerings and sin offerings
you were not pleased.
7 Then I said, ‘Here I am—it is written about me in the scroll—
I have come to do your will, my God.’”[a]
8 First he said, “Sacrifices and offerings, burnt offerings and sin offerings you did not desire, nor were you pleased with them”—though they were offered in accordance with the law. 9 Then he said, “Here I am, I have come to do your will.” He sets aside the first to establish the second. 10 And by that will, we have been made holy through the sacrifice of the body of Jesus Christ once for all. Hebrews 10:1-10