“Natural selection is also responsible for cultural evolution that produces morals that say that killing is wrong and ultimately leads to the “Golden Rule”, which predates Christianity.”
This is typical of the non-scientific speculation and hand waving that passes for “thinking” by evolutionists.
Please provide me with a reference to the specific, random genetic sequences that produced “morals that say killing is wrong.”
You or someone else concocted that one out of thin air, and because it seemed vaguely plausible and supports your grandiose “theory,” you announce it as “scientific fact.”
As already stated, it is a meme and not a gene. To process a meme all that is needed is a brain. I'm not sure what genes are responsible for brain development, but I can provide scientific evidence that brains exists.