It’s the other way around. Lack of religiosity is the default state and with it you get the default discontent with death, but a religion with an afterlife could reduce discontent with death.
On the contrary: https://en.wikipedia.org/wiki/List_of_countries_by_irreligio...
> and with it you get the default discontent with death
That is a huge assumption. There is a huge variety of ways in which societies, cultures and individuals relate and have related with death.
I’m not assuming anything, I’m not pegging the default discontent with death to a particular value, I don’t know what it is and it’s irrelevant. I’m just saying the some religions, with certain concepts of afterlife, like catholicism, would reduce that discontent.
What's different about the post-birth state compared to post-death?