The Neanderthal Afterlife

The Neanderthals of the alternate timeline have virtually no spiritual beliefs. They do not believe in any deities or spirits, any other realms or dimensions (other than the physically provable alternate timeline), and certainly no afterlife. Their reaction to the spiritual beliefs of homo sapiens is either polite confusion or open derision.

In fact, their entire morality is based on the idea that there is only one life, and thus, it is important to get things right the first time.

The Neanderthal morality would be absolutely loved by Richard Dawkins.