Anti-natalism does not even make sense from an Atheistic perspective. Because if you're a Nihilist about life, then in a fundamental way, there is no hierarchy of values or morals. What is bad and good is non-existent and no intrinsic worth can be put upon anything. So, no, anti-Natalism or pro-Natalism is equally not a conversation. Even the analysis of such is worthless, presuppositions are not worth processing (as any measure of "worth" is worthless). Associating suffering with negative connotations and pleasure, with positive, is conceptually unfounded if you draw a concordant line. In fact, the whole thing in its practice is not humanly tenable because any form of analysis or processing, a fundamental human condition for survival, is itself a strong contradiction to it. The self-denial of life in that case is paradoxical in a way. Because a real nihilist should not claim to be anything at all actually, even a nihilist.
The far majority of Atheists and nihilists are not consistent or know what they are believing to begin with. Morality for atheists is nothing more than aesthetics; if they at all know what atheism entails (many people are just self-centered egoists that want to do hedonism without religious commitment or perceived repercussions so they call themselves atheist without knowing much of what it really means). You might wonder why I included nihilism into it -- the reason brought in nihilism is because anti-Natalist thought is a synthesis of all those wicked thinking.
Anyone who believes humanity should die off is messed up in the head and are corrupt. It's a plot to a cartoon villain story. "The child did not consent to be created" -- what idiots.