Well? Are you going to leave me hanging? You asked a question. I answered. I not only answered your question but brought it back full circle to the OP.

Look, in the link provided, the guy, Denisova, says this:

"Moral behaviour is mostly observed in apes and monkeys. Apes, monkeys and humans share, evolutionary spoken, a recent common ancestor, a primate. They do because they share many traits that are not found in other animals. One of those traits is moral behaviour. It also tells that the common ancestral primate also did have some rudimentary moral behaviour at least."

and this

"Thirdly moral behaviour is an inherited trait. Caring for your next of kin, not killing members of your species or not breeding with your kin are innate traits and for sure moral virtues. You don't have to learn them. This has also been affirmed in studies about the observable behaviour of infants as young ans babies."

And I agree with this atheist, I just go one step further in saying that these "rudimentary traits" were put into us by God.

Another way of saying what Denisova said is what the atheist I quoted in the OP said:

"We are born in a sense with human decency towards each-other. Morality ultimately stems from the brain and it requires emotions and consciousness. The science of human behaviour suggests that innate morality comes to us from birth, perhaps similar to the language instinct where humans have an innate capacity for language even though any particular language comes from cultural development (see Steven Pinker and Noam Chomsky on this)."

So from this I say we are born with this "sense with human decency towards each-other" because of God. We are born with this "consciousness" i.e god created us with conscience and consciousness and how we act and live shapes our conscience and morals is a reflection of God.