I guess it depends on their definition of good. Catholics don't think it is "good" to use birth control, for instance. Also, doesn't this make the Catholic church superfluous? If I can still get to heaven by not being a Catholic, why bother with communion, tithing, or any of their other dogmas? Still, this is an unexpected and positive step in the right direction. Very few religions allow for salvation for atheists, the world's most hated minority.
From Huffington Post:
“They complain,” the Pope said in his homily, because they say, “If he is not one of us, he cannot do good. If he is not of our party, he cannot do good.” And Jesus corrects them: “Do not hinder him, he says, let him do good.” The disciples, Pope Francis explains, “were a little intolerant,” closed off by the idea of possessing the truth, convinced that “those who do not have the truth, cannot do good.” “This was wrong . . . Jesus broadens the horizon.” Pope Francis said, “The root of this possibility of doing good – that we all have – is in creation”
"The Lord created us in His image and likeness, and we are the image of the Lord, and He does good and all of us have this commandment at heart: do good and do not do evil. All of us. ‘But, Father, this is not Catholic! He cannot do good.’ Yes, he can... "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!".. 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.”
"Pope Francis is saying, more clearly than ever before, that Christ offered himself as a sacrifice for everyone. That's always been a Christian belief. You can find St. Paul saying in the First Letter to Timothy that Jesus gave himself as a "ransom for all." But rarely do you hear it said by Catholics so forcefully, and with such evident joy. And in this era of religious controversies, it's a timely reminder that God cannot be confined to our narrow categories."