Someone has never watched the late, late show. Puppets and clowns... EVIL!
Of course you are correct, nothing we do matters under double predestination. Neither the good we do, nor, to be consistent, the evil. In fact we are not responsible even though the God Calvin imagines will hold us to account for the... er... um... evil he does through us. Brain explodes.
From double predestination springs the theory of OSAS or eternal security, if we can't cooperate in our salvation then we can't be uncooperative in losing it.
This is why the Sacraments don't do anything... because there's nothing to do. The cooperation of the BVM is immaterial because everything we do is also immaterial, it's not just her.
CANON 6. If anyone says that God has mercy upon us when, apart from his grace, we believe, will, desire, strive, labor, pray, watch, study, seek, ask, or knock, but does not confess that it is by the infusion and inspiration of the Holy Spirit within us that we have the faith, the will, or the strength to do all these things as we ought; or if anyone makes the assistance of grace depend on the humility or obedience of man and does not agree that it is a gift of grace itself that we are obedient and humble, he contradicts the Apostle who says, "What have you that you did not receive?" (1 Cor. 4:7), and, "But by the grace of God I am what I am" (1 Cor. 15:10).
CANON 7. If anyone affirms that we can form any right opinion or make any right choice which relates to the salvation of eternal life, as is expedient for us, or that we can be saved, that is, assent to the preaching of the gospel through our natural powers without the illumination and inspiration of the Holy Spirit, who makes all men gladly assent to and believe in the truth, he is led astray by a heretical spirit, and does not understand the voice of God who says in the Gospel, "For apart from me you can do nothing" (John 15:5), and the word of the Apostle, "Not that we are competent of ourselves to claim anything as coming from us; our competence is from God" (2 Cor. 3:5).
Rom 9;10 And not only this, but there was Rebekah also, when she had conceived twins by one man, our father Isaac; 11 for though the twins were not yet born and had not done anything good or bad, so that God's purpose according to His choice would stand, not because of works but because of Him who calls, 12 it was said to her, "THE OLDER WILL SERVE THE YOUNGER." 13 Just as it is written, "JACOB I LOVED, BUT ESAU I HATED."
14 What shall we say then? There is no injustice with God, is there? May it never be! 15 For He says to Moses, "I WILL HAVE MERCY ON WHOM I HAVE MERCY, AND I WILL HAVE COMPASSION ON WHOM I HAVE COMPASSION."
16 So then it does not depend on the man who wills or the man who runs, but on God who has mercy. 17For the Scripture says to Pharaoh, "FOR THIS VERY PURPOSE I RAISED YOU UP, TO DEMONSTRATE MY POWER IN YOU, AND THAT MY NAME MIGHT BE PROCLAIMED THROUGHOUT THE WHOLE EARTH."
18So then He has mercy on whom He desires, and He hardens whom He desires. 19 You will say to me then, "Why does He still find fault? For who resists His will?"
where have I heard that before?
20 On the contrary, who are you, O man, who answers back to God? The thing molded will not say to the molder, "Why did you make me like this," will it?
21 Or does not the potter have a right over the clay, to make from the same lump one vessel for honorable use and another for common use?
22 What if God, although willing to demonstrate His wrath and to make His power known, endured with much patience vessels of wrath prepared for destruction?
23 And He did so to make known the riches of His glory upon vessels of mercy, which He prepared beforehand for glory, 24even us, whom He also called, not from among Jews only, but also from among Gentiles. 25 As He says also in Hosea, "I WILL CALL THOSE WHO WERE NOT MY PEOPLE, 'MY PEOPLE,' AND HER WHO WAS NOT BELOVED, 'BELOVED.'" 26"AND IT SHALL BE THAT IN THE PLACE WHERE IT WAS SAID TO THEM, 'YOU ARE NOT MY PEOPLE,' THERE THEY SHALL BE CALLED SONS OF THE LIVING GOD."
Nonsense. The good that we do is the good work of Christ within us. And that good work of Christ will stand in testimony to God's love for us when we are judged. Judged not by our sins, but by the righteousness of Christ within us.
The evil that men do, when not covered by the blood of Christ, will condemn them.
Read Hebrews 10. Or don't and remain clueless.