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.”
- As quoted in “Pope at Mass: Culture of encounter is the foundation of peace” at Vatican Radio (22 May 2013)
The above is the actual quote. https://www.snopes.com/fact-check/pope-francis-belief-in-god/
This is the widely circulated “mis quote”.