Why aren't people obsessed with fixing the problem of their impending death?

I just finished watching the E! true Hollywood Story about Gilligan's Island. I am watching The Birth of a Nation (1915). One had half the cast dead of old age, the other all of the cast is long since dead. When I was 20, it was easier to push the problem back, but as I'm well into middle age, and seeing people who were young adults when I was a kid dying of old age, it has really become clear recently that death is the elephant in the room that people rarely talk about. It seems like it should be the obsession of every person on the planet. What happens when we die? I don't understand atheism at all. Even if nothing happens, what's the value of acting as though that's the case. Jesus' promise of resurrection seems like the only plausible hope. I just don't get why more people don't spend their life on it. How could anyone be nominal in their Christianity?