Since your personal theology, as you have described it here in these threads, is in conflict with not only that of the Catholic Church but with 99% of Protestantism on significant issues of doctrine and dogma can you explain to me how you can celebrate the movement of anyone from one error to another and not at the same time mourn the shrinking membership in the OPC?
Do you not see the conversion of a single atheist, Buddhist, Muslim, Mormon, Hindu or Jew to Catholicism as a victory for Christ? Do you see the musical church game played by so very many within Protestantism who are perpetually church shopping and hopping as a rousing endorsement of Protestantism?
Do you think ones Salvation is more determined by which pew one sits in than what is in their hearts and how they live their lives?
“Not everyone who says to Me, ‘Lord, Lord,’ will enter the kingdom of heaven, but he who does the will of My Father who is in heaven will enter." - Matthew 7:21
Calvinism simply says God is in control of His creation. I realize this is foreign to most RCs although before the Reformation Rome, too, believed that, as did all of Christendom.
RCs think they can earn their way to heaven when Scripture says it is only by free grace through faith in Jesus Christ, the only Mediator between God and men, that men are saved. And God gives grace to whom He will.
This is Biblical. Read your Bible.