There's one great advantage in godless people. When they do good, it won't be with the hope of going to heaven, nor in fear of the fire and brimstone of hell. We know it won't be for either reward or punishment after they die. 

Godless people, if they're good-natured, will do good for the only good reaon there is - because something right,  full stop.  This is vastly underrated. You can always suspect  a believer's motives as having to do with religious reward or punishment. More generally, fear and greed being such powerful drives in the world, you'll never know whether love and compassion had anything to do with anyeone acting kindly to their fellow human being.

Besides, are atheists less capable of love and compassion, of charity and altruistic behaviour, than people of piety? 

In 1232 Pope Gregory IX established the Inquisition for the suppression of heresy in northern Italy and southern France. He became notorious for the use of torture, forcing conversion. It was such zeal that has earned God a bad name. On the other hand in 2017 CNN Religion Editor Daniel Burke quoted Pope Francis as saying in 2013,

“The Lord has redeemed all of us with the Blood of Christ: not just Catholics, even the atheists. Everyone! We must meet one another doing good." Someone said, "But I don’t believe, Father, I am an atheist!" Pope Francis replied, "But do good: we will meet one another there.” (CNN, 2027)

It comes as no surprise that Jesus in person is quoted in the Gospel of Mathew 7 as saying, "Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father who is in heaven."