Can objective morality exist in Atheism?

[tavarish]

So what? It ultimately doesn't matter where values are subjective.

Sure it does. If the society you belong to does not condone it, it matters.

If I subjectively think that killing babies is fine, the society I'm in has something different to say about it.

This does not mean that there is an objective standard, it just means I'm only as moral as my subjective societal norms perceive me to be.

Again, so what? Why choose procreation over death?

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Survival and procreation go hand in hand. Your genetic code is represented in offspring, and your "legacy" can live on biologically.

I understand what you're alluding to. I'm not sure if it's even a relevant question. I am sure that I'm not qualified to answer, especially with my limited knowledge of biology and psychology. However, I can speculate.

If sentient life could not replicate, there would be no life proliferation in general. It would be a short-lived experience. My guess is, life, through natural selection, remained living by devising a way in which it could reproduce and form more sentient beings.

Sir, respectfully, that's not the concept of morality, that's Evolutionary theory of survival, the two are not the same, despite your equivocation. Morality involves the concept of "rightness" and wrongness" the theory of Evolution only involves surviving to procreate, regardless of right and wrong.

let's look at a moral. I'll take myself as a hypothetical example.

I don't want others to harm me in a violent manner. To harm someone violently is immoral to me. Violence is wrong in my opinion.
However, there are many others in the world who view violence as the only positive way to solve their disputes. They see it as an outlet and a constructive force.

This adheres to the golden rule, yet is subjective, and the basis of how morality is formed. Add to this a social structure with acceptable norms and you have a recipe for a civilized, moral society.