Here is the source on Facebook. And here is the Snopes comment on it, which I found in the comments thread:
"The Lord has redeemed all of us, all of us, with the Blood of Christ: all of us, not just Catholics. Everyone! 'Father, the atheists?' Even the atheists. Everyone! And this Blood makes us children of God of the first class. We are created children in the likeness of God and the Blood of Christ has redeemed us all. And we all have a duty to do good. And this commandment for everyone to do good, I think, is a beautiful path towards peace. If we, each doing our own part, if we do good to others, if we meet there, doing good, and we go slowly, gently, little by little, we will make that culture of encounter: We need that so much. We must meet one another doing good. 'But I don't believe, Father, I am an atheist!' But do good: We will meet one another there."
It appears to be a transmogrification of this quote. However, when Rome habitually puts out statements where both sides can take away their own meaning, (see also here for documentation of that phenomenon) then you would expect something like this to happen.
But I found it because it had been shared by a neighbor, just yesterday, with the one-word qualification, “Profound”.