The subject question is one that is posed by Mr. William Albrecht's latest video (link). The question is an interesting one. On the one hand, we certainly do wish and pray and act for the good of Roman Catholics. A substantial number of the posts on this blog of late have been directed toward Roman Catholics and Roman Catholicism with the aim of doing them good, and they are accompanied by prayers to the same end. Let there be no doubt about this.
Let there be no doubt, we are addressing the claims of Roman Catholicism primarily for the good of those who are in that religion or tempted to become a part of that religion. It is not for our benefit, and it is certainly not out of any hostility for the people who make up that religion.
And that is not just true of Roman Catholicism, but of Atheism, Islam, Mormonism, and all men of whatever creed or anti-creed they may have, with whom we engage. We do not challenge the claims of others out of any negative animus but out of love for them and concern for their souls.
On the other hand, we do not want to give them the impression that God is favorably inclined to them while they remain opposed to the gospel. Thus, while we proclaim the gospel of salvation through faith in Christ alone, we do not suggest that God presently is favorably inclined on those who oppose the gospel: He is not.
Recall the words of the prophet:
Jeremiah 6:14 They have healed also the hurt of the daughter of my people slightly, saying, Peace, peace; when there is no peace.
This is why we do not normally say "God bless you" to an enemy of the faith, although we do wish God to bless them with the grace of regeneration and the gift of faith, because the expression is typically viewed as suggesting that we view them as already in God's favor where they are.
But yes, I do wish for God's blessing on you, Mr. William Albrecht, and I will (as you asked) pray for you: not that you will continue on in opposition to the gospel that Paul preached, but that you will be overwhelmed by the Scriptures and brought to faith in Christ alone for salvation.